A dead phone becomes a real problem when the nearest outlet is across an airport, halfway through a hike, or already occupied at a crowded café. The Best portable charger power bank for most people is not the largest one. It is the model that balances capacity, charging speed, size, cable convenience, and the devices you actually carry.
We compared compact 10, 000mAh banks, airline-friendly larger models, and high-capacity packs that are better suited to camping or outages. The picks range from tiny emergency backups to laptop-capable chargers with several USB-C outputs.
For most people, the INIU 45W Mini 10000 is the single best pick. The rest cover multi-device travel, very large capacity, built-in cables, laptop charging, and slim everyday carry.
Comparison table
| # | Product | Award | Capacity | Output | Best for |
|---|---|---|---|---|---|
| 1 | INIU 45W Mini 10000 | Best overall | 10, 000mAh | 45W | Fast daily charging |
| 2 | ZZI 60000mAh Power Bank | Best maximum capacity | 60, 000mAh | 22.5W | Extended off-grid use |
| 3 | YBYP 50000mAh Cable Bank | Best cable selection | 50, 000mAh | 22.5W | Groups with mixed devices |
| 4 | OHOVIV 50000mAh Cable Bank | Best for many devices | 50, 000mAh | 22.5W | Charging up to six devices |
| 5 | Anker 25000mAh Laptop Bank | Best for laptops | 25, 000mAh | 165W total | Laptop and multi-device users |
| 6 | INIU 20000mAh Mini | Best mid-capacity compact bank | 20, 000mAh | 22.5W | Several phone charges |
| 7 | Zmmyuluo 10000mAh Cable Bank | Best built-in cable design | 10, 000mAh | Not stated | Cable-free daily carry |
| 8 | INIU Ultra Mini 10000 | Best ultra-small fast bank | 10, 000mAh | 45W | Small bags and fast top-ups |
| 9 | Anker PowerCore Slim 10000 | Best slim basic bank | 10, 000mAh | Not stated | Simple everyday backup |
| 10 | Orfeika 20000mAh Cable Bank | Best cable-equipped capacity | 20, 000mAh | 20W | Travel with mixed devices |
1. INIU 45W Mini 10000: Best Overall
Pros
- 45W output is unusually strong for a 10, 000mAh bank
- Compact 0.5-inch-thick design
- Detachable braided USB-C cable
- Airline-safe capacity
- Built-in cable can be replaced
Cons
- Only 10, 000mAh of capacity
- The short attached cable is not ideal for every setup
- No multi-cable bundle for older connectors
Best for: people who want a small daily bank that can also charge demanding devices quickly.
The INIU 45W Mini 10000 is the easiest bank here to recommend without a long list of caveats. It is thin enough for a coat pocket or small bag, but its 45W output gives it more headroom than ordinary phone-only backups. The practical result is a charger that works for a phone during a commute and remains useful with a tablet, handheld gaming device, or compatible laptop accessory.
Its 10, 000mAh capacity is aimed at daily backup rather than a week away from a wall outlet. INIU says it can provide nearly two smartphone charges, which is the right way to think about this size. The bank measures 5.26 by 2.7 by 0.5 inches and weighs about 0.4 pounds, so it avoids the brick-like feel of the larger high-capacity picks. That thin profile is one of its strongest advantages.
The 0.4-foot braided USB-C cable is attached to the charger, but it is detachable rather than permanently trapped inside the housing. That distinction matters. If the cable eventually becomes damaged, it can be swapped instead of turning the entire bank into electronic waste. It also includes a USB-C cable for modern phones and tablets without requiring a separate cord in the bag.
Compared with the INIU Ultra Mini 10000, this model is a little less aggressively tiny, while the Ultra Mini has a shorter 3.29-inch length and a lighter listed weight. The INIU 45W Mini 10000 has the more conventional shape and a slightly longer body, which may be easier to hold while charging. Its real weakness is capacity. Anyone needing several full phone charges should choose the INIU 20000mAh Mini or a larger model. For daily carry, though, this is the one we'd keep.
2. ZZI 60000mAh Power Bank: Best Maximum Capacity
Pros
- Largest capacity in this roundup
- Can charge up to five devices at once
- 3-in-1 cable supports several connector types
- Digital display shows remaining charge
- Five-layer safety protection
Cons
- Not allowed on airplanes
- Nearly one pound before adding cables
- 22.5W output is less suited to high-demand devices
Best for: camping, outages, and extended trips where maximum phone capacity matters more than airline portability.
The ZZI 60000mAh Power Bank is for a very specific kind of problem: keeping several devices running for a long time without a dependable outlet. Its 60, 000mAh rating is the largest here, and the listing says it can provide up to 10 charges for an iPhone 15. That makes it far more appropriate for an outage kit, campsite, or group trip than for a pocket.
The output is rated at 22.5W, with a smart recognition chip that adjusts output for different devices. ZZI says an iPhone 15 can reach 60 percent in 30 minutes under its stated conditions. That is respectable for phones, though the Anker 25000mAh Laptop Bank is the clear choice for laptops and high-draw gear. The ZZI is about endurance, not maximum power.
Its included 3-in-1 nylon cable combines Type-C, iOS, and Micro USB connectors. Along with the bank's other outputs, that arrangement supports charging up to five devices simultaneously. The digital LED display is more useful than a row of vague indicator lights because it shows the remaining percentage directly. The 5.8 by 2.9 by 1.1-inch body is fairly compact for the capacity, but its listed 0.96-pound weight is still substantial.
The most important limitation is the airline warning. This bank is explicitly not allowed on airplanes, so do not choose it for a flight or assume that a carry-on bag solves the issue. Readers planning air travel should look at the INIU 45W Mini 10000, INIU 20000mAh Mini, or Anker 25000mAh Laptop Bank instead. For grounded travel, blackouts, and shared charging, the ZZI offers the longest reserve in this group.
3. YBYP 50000mAh Cable Bank: Best Cable Selection
Pros
- Four integrated cables cover common connectors
- 50, 000mAh capacity
- Up to five devices can charge at once
- Percentage display is precise
- Active cooling and eight-layer protection
Cons
- Not allowed on airplanes
- Larger than ordinary daily-carry banks
- Built-in cables add complexity and bulk
Best for: families or groups carrying iOS, USB-C, Micro USB, and USB-A devices.
YBYP takes the cable problem seriously. The 50000mAh Cable Bank has four integrated leads: Micro-B, USB-A, Type-C, and iOS. That is a useful collection for a household or group with mixed devices, because the charger does not depend on everyone remembering a separate cable. Three additional ports expand the arrangement, and the listing says up to five devices can charge at once.
The 22.5W output is suitable for fast phone top-ups. YBYP claims an iPhone 17 can reach 55 percent in 30 minutes and a Galaxy S25 can reach 60 percent in the same period. Those figures are manufacturer claims, but they indicate the intended use clearly. This is a phone and tablet bank first, not a replacement for the laptop-focused Anker.
Its 50, 000mAh capacity is paired with a body measuring 4.8 by 3.1 by 1.1 inches and weighing 0.75 pounds. That is a notable amount of stored power in a relatively short package, although the 3.1-inch width and one-inch thickness will still be obvious in a small bag. The digital gauge displays the charge percentage, while the claimed eight-layer protection and heat-dissipation design address the extra heat that can come with several connected devices.
YBYP beats the ZZI when connector flexibility is the priority, while ZZI has the larger capacity and a simpler 3-in-1 cable approach. OHOVIV can charge one more device at the same time, but it weighs more and has a slightly thicker body. The YBYP's main weakness is its flight restriction, so it is a poor choice for air travel. Choose it for road trips, camping, emergency storage, or shared use where four built-in cable types can replace a pouch full of loose cords.
4. OHOVIV 50000mAh Cable Bank: Best for Many Devices
Pros
- Six devices can charge simultaneously
- Four built-in cables
- 22.5W PD and QC4.0 charging
- LED percentage display
- Multiple temperature and circuit protections
Cons
- Not suitable for airplane travel
- Heavier than the YBYP
- Wall charger is not included
Best for: large groups that need the most simultaneous charging connections.
The OHOVIV 50000mAh Cable Bank is the group charger of this roundup. Four built-in cables cover iPhone, Type-C, Micro, and USB-A devices, while two USB-A ports and one Type-C port provide extra connection options. The result is support for up to six devices at once, which is more useful at a family campsite or during a shared power outage than the smaller banks can be.
Its 22.5W PD output and QC4.0 support target fast phone charging. OHOVIV says the charger can take an iPhone to 55 percent in 30 minutes, and USB-C supports both input and output. That versatility makes recharging the bank less fussy, especially when several people bring different USB-C cables or wall adapters.
The dimensions are 5.82 by 2.83 by 1.18 inches, and the listed weight is 1.07 pounds. It is therefore not a lightweight travel companion, despite the compact language in the product description. The LED display shows remaining power, and the listing calls out 10 protection systems plus NTC temperature control. A 365-day replacement guarantee and 24/7 support are included in the product information.
Compared with YBYP, OHOVIV offers one more simultaneous connection but weighs roughly a third of a pound more. The ZZI offers even more capacity, though it does not provide the same four-cable combination. The weakness is easy to identify: it is overkill for one phone and unsuitable for flights. If your priority is keeping a group connected at the same time, OHOVIV is the more convenient choice. If you travel alone, the INIU 20000mAh Mini is much easier to live with.
5. Anker 25000mAh Laptop Bank: Best for Laptops
Pros
- 165W total output
- Three USB-C ports rated at 100W
- Can charge four devices at once
- Retractable USB-C cable
- Airline carry-on friendly capacity
Cons
- Heavier and larger than phone-focused banks
- Charger shown with the product is not included
- Best features matter less for phone-only users
Best for: laptop owners who need substantial USB-C output away from a wall socket.
The Anker 25000mAh Laptop Bank is the specialist pick, and it earns that position by offering power that the other compact banks do not. It has three USB-C ports rated at 100W and a 165W total output. That configuration is designed for a laptop, phone, tablet, and other USB devices in the same travel setup, rather than just topping up a phone.
The 25, 000mAh capacity gives it a useful middle ground. It stores more energy than the 10, 000mAh and 20, 000mAh choices, but it remains within the product's stated 100Wh airline carry-on limit. Anker also includes two USB-C cables. One extends to 2.3 feet and is rated for 20, 000 retractions, while the shorter 0.98-foot cable doubles as a carrying strap and is rated for more than 20, 000 bends.
The bank measures about 6.18 by 2.13 by 1.93 inches and weighs 1.3125 pounds. That is a lot to carry beside a phone, but reasonable for a laptop-capable battery with several high-output ports. It can charge four devices at once, using the built-in cables, USB-A, and USB-C connections. A protective pouch and 18-month warranty are included, while the wall charger is not.
The Anker is a much better fit for a remote worker than the INIU 45W Mini 10000, and it is the only pick here that makes laptop charging central to its design. The trade-off is size. A phone-only user should skip it, because the weight and output capacity add little benefit to a basic commute. Laptop owners, tablet users, and travelers who carry several USB-C devices should choose it over the larger cable banks, especially when airline compatibility matters.
6. INIU 20000mAh Mini: Best Mid-Capacity Compact Bank
Pros
- 20, 000mAh capacity in a compact body
- 22.5W fast charging
- Built-in USB-C lanyard cable
- Built-in flashlight
- Airline-approved capacity
Cons
- Only one built-in connector
- Output is below laptop-focused models
- Thick enough to feel substantial in a pocket
Best for: people who need multiple phone charges without moving up to a large cable bank.
The INIU 20000mAh Mini is the sensible step up from a small emergency bank. It has twice the nominal capacity of the 10, 000mAh models while keeping a relatively short 4.1-inch length. INIU describes it as capable of four full phone charges, though the actual number varies by phone and charging losses. The important point is that it is designed for several days of ordinary phone use rather than one afternoon.
Its 22.5W output is enough for quick phone charging. The listing says it can charge a Samsung S25 to 70 percent or an iPhone 16 to 60 percent in 25 minutes under the stated conditions. Thermal sensors are intended to manage heat, and a built-in flashlight adds some practical usefulness during a power outage or while searching inside a dark bag.
The USB-C cable is integrated into the bank as a nylon lanyard. That saves space and means one cable is always available, while extra ports accommodate Apple devices and other connections. The listed dimensions are 4.1 by 2.8 by 1.2 inches. It is still pocketable in a coat, but its thickness is more noticeable than the INIU 45W Mini 10000 or Anker PowerCore Slim 10000.
This is the better endurance choice for most phone users who find 10, 000mAh limiting. The Anker 25000mAh Laptop Bank has much higher output and more ports, but is considerably heavier. The INIU 20000mAh Mini also has less connector convenience than Orfeika's four-cable design. Its weakness is therefore flexibility, not capacity. Pick it when you want several phone charges, a flashlight, and airline-friendly storage without carrying a full-size group bank.
When battery rules matter on a trip, the difference between carry-on and restricted battery capacity is worth checking before you pack.
7. Zmmyuluo 10000mAh Cable Bank: Best Built-in Cable Design
Pros
- Four built-in cables
- Compact 0.7-inch thickness
- Digital percentage display
- Can charge up to five devices
- Airline carry-on friendly
Cons
- 10, 000mAh capacity is limited for groups
- Output wattage is not stated
- Integrated cables cannot be upgraded independently
Best for: commuters who want several connector types without carrying separate charging leads.
The Zmmyuluo 10000mAh Cable Bank is built around convenience rather than raw capacity. Four integrated cables cover iOS, USB-C, and Micro USB devices, and the bank also includes external ports. That makes it a practical shared charger for a short trip, especially when the people using it carry different phones or earbuds.
The product information says it can charge up to five devices at once, using three built-in charging cables and two external ports. It also includes a digital display that shows the remaining battery from 0 to 100 percent. That is a better indicator than four small lights when you need to know whether the bank has enough reserve for the trip home.
At 4.17 by 2.8 by 0.71 inches and about 0.41 pounds, it is one of the more manageable cable-equipped options. The high-density battery design is listed as up to 40 percent more compact and 45 percent lighter than traditional banks of similar capacity. It is also described as meeting TSA carry-on battery guidelines. The product includes a USB-C charging cable and 24-month support.
The main omission is output information. Unlike the INIU models and the 22.5W YBYP and OHOVIV banks, Zmmyuluo does not state a maximum wattage in the supplied details. That makes it harder to judge for fast charging or demanding devices. It beats Anker PowerCore Slim 10000 on connector convenience, but Anker has clearer durability information and a more straightforward design. Choose Zmmyuluo when carrying the right cable is your recurring problem, not when maximum speed is the priority.
8. INIU Ultra Mini 10000: Best Ultra-Small Fast Bank
Pros
- Very small 3.29-inch length
- 45W output
- Detachable braided USB-C lanyard
- Airline-approved capacity
- Designed for phones, tablets, and gaming devices
Cons
- Only 10, 000mAh capacity
- One main integrated cable
- Compact shape may be easier to misplace
Best for: people who want high output in the smallest possible everyday bank.
The INIU Ultra Mini 10000 is the smallest-feeling performance bank in the list. Its listed length is only 3.29 inches, with a 2.09-inch width and one-inch height. The product page compares its footprint to an AirPods Pro case, and that captures the appeal: it can disappear into a small purse, a compact sling, or a pocket that would reject a longer rectangular bank.
The surprising part is the 45W output. That is the same headline output as the larger INIU 45W Mini 10000, so this little bank is not restricted to slow emergency charging. INIU says it can charge a Samsung S26 Ultra from 20 to 92 percent or an iPhone 17 Pro Max to 75 percent in 30 minutes under its stated conditions. It is also positioned for tablets, Nintendo Switch, Steam Deck, and similar high-draw devices.
A detachable nylon-braided USB-C lanyard provides the cable, and the cable can be replaced if it becomes worn. The bank is listed as airline approved, making it more flexible for travel than the 50, 000mAh and 60, 000mAh options. Its listed weight is only 0.09 pounds, though that figure is unusually low for a 10, 000mAh battery, so buyers should treat the size claims as the central advantage rather than rely on the weight alone.
The Ultra Mini beats the INIU 20000mAh Mini on portability and output, but gives up substantial reserve power. The INIU 45W Mini 10000 has a more conventional shape and a slightly longer body, which some users may find easier to handle. Skip this one if you need four cables or multiple full phone charges. For a small bag and fast top-ups, it is an excellent alternative to the top pick.
For an iPhone-heavy household, how much capacity a phone really needs during a normal day is a more useful question than simply choosing the largest battery.
9. Anker PowerCore Slim 10000: Best Slim Basic Bank
Pros
- Slim 0.61-inch profile
- Two-way USB-C charging
- Scratch-resistant construction
- Certified 3.2-foot drop test
- Simple, familiar design
Cons
- No built-in charging cable
- Output wattage is not stated
- Longer and heavier than the smallest 10, 000mAh picks
Best for: users who want a straightforward slim bank from an established charger brand.
The Anker PowerCore Slim 10000 is the uncomplicated option. It does not add a flashlight, four integrated cables, a high-capacity reserve, or laptop-class output. Instead, it provides a slim battery, a USB-C port, and a cable in the box. For someone who already carries a preferred USB-C lead, that simplicity can be an advantage.
Anker says the 10, 000mAh capacity provides two charges for an iPhone 15, 1.93 charges for a Galaxy S23, and 1.23 charges for an iPad mini 6. Those figures place it squarely in the daily-backup category. USB-C supports both input and output, so the same port handles recharging the bank and charging a device.
The dimensions are listed as 5.99 by 2.81 by 0.61 inches, with a weight of 8.6 ounces. It is thin, but its length is greater than the INIU Ultra Mini 10000 and Zmmyuluo. Anker also lists scratch resistance and a 3.2-foot drop test, details that give this basic model a stronger durability story than many generic cable banks. An 18-month warranty is included.
The weakness is speed transparency. The supplied product details do not state an output wattage, so the Anker is less compelling for fast charging than either 45W INIU model. It also needs a separate cable, unlike Zmmyuluo. Choose it when you prefer a conventional, slim bank and already have the cable you want. If you want maximum charging speed in the same general capacity class, the INIU 45W Mini 10000 is the stronger pick.
10. Orfeika 20000mAh Cable Bank: Best Cable-Equipped Capacity
Pros
- 20, 000mAh capacity
- Four built-in cables
- Can charge up to six devices
- Low-power mode for earbuds and watches
- Airline carry-on compatible
Cons
- 20W output is below the fastest picks
- Long 6.3-inch body
- Built-in cable arrangement adds weight
Best for: travelers who want extra capacity and several built-in connectors in one package.
The Orfeika 20000mAh Cable Bank combines the two features many travelers ask for: more reserve than a basic daily bank and cables that are always attached. It includes four built-in cables, with three for output and one for input, covering iPhone, USB-C, Galaxy, and Micro USB equipment. That reduces the need to pack a separate cable pouch.
It supports up to six devices at once through three built-in cables and three external ports. The USB-C output reaches 20W, and Orfeika says that can charge an iPhone 16 to 50 percent in 45 minutes. That is adequate for phones, but slower than the 22.5W options and far behind Anker's laptop-oriented output. Dual USB-C ports also support recharging the bank at up to 18W.
The bank measures 6.3 by 2.85 by 0.74 inches and weighs 0.73 pounds. Its 20, 000mAh capacity is listed as 77Wh and compliant with airline carry-on regulations. A digital display shows the exact remaining percentage, while low-power mode is designed for small devices such as earbuds and smartwatches. The scratch-resistant, fire-retardant shell and six-layer protection add useful reassurance, and a travel pouch is included.
Orfeika is more versatile than the INIU 20000mAh Mini because it carries four cable types, but it is longer and slower. It also has less output than YBYP and OHOVIV. The choice comes down to convenience and capacity: choose Orfeika if several devices and connectors matter more than the fastest possible top-up. If you mostly carry one phone, the smaller INIU models are easier to carry.
How to choose best portable charger power bank
The right bank depends on the devices in your bag and how far you expect to be from an outlet. Focus on capacity, output, connections, physical size, and travel restrictions before choosing a design.
Capacity
Capacity is listed in milliamp-hours, or mAh. A 10, 000mAh bank is generally aimed at daily backup and roughly one to two phone charges, while 20, 000mAh models are better for several charges or a longer weekend. The 50, 000mAh and 60, 000mAh banks are intended for extended off-grid use, but they are not airplane-friendly.
Advertised capacity is not identical to the energy that reaches a phone. Conversion losses, the phone's battery size, and charging conditions all affect the final result. Choose the smallest capacity that covers your normal use unless you are preparing for an outage or several days outdoors.
Charging output
Output, measured in watts, indicates how quickly the bank can supply compatible devices. The 45W INIU models are unusually capable for compact 10, 000mAh banks. The 20W Orfeika and 22.5W ZZI, YBYP, and OHOVIV models are primarily phone and tablet chargers.
Laptop charging needs more careful matching. The Anker 25000mAh Laptop Bank has three 100W USB-C ports and 165W total output, while the other banks do not make the same laptop-focused promise. A high wattage rating does not guarantee that every phone will charge at that speed, since the device and cable must also support it.
Ports and built-in cables
Built-in cables are convenient when a group carries mixed devices. YBYP, OHOVIV, Zmmyuluo, and Orfeika include several connector types, so they reduce loose-cable clutter. The drawback is that an integrated cable can become a failure point, although the INIU models with detachable USB-C cables can be replaced.
A conventional bank with open ports gives you more freedom to choose cable length and connector type. It is often the better arrangement for a single user who already owns reliable cables. Count both the number of ports and the total output when several devices will charge at once.
Size and weight
A large capacity bank cannot be genuinely pocket-light. The ZZI, YBYP, and OHOVIV models store much more energy than the compact INIU and Anker banks, but their thickness and weight are more noticeable. A slim 10, 000mAh bank works well for commuting, concerts, and ordinary phone emergencies.
Dimensions also affect how comfortable the bank is while connected. A short model such as the INIU Ultra Mini 10000 is easier to use in a small bag, while the longer Anker PowerCore Slim 10000 may sit more neatly beside a phone in a backpack pocket.
Airline suitability
Airline rules are a deciding factor, not a minor footnote. The ZZI 60000mAh Power Bank, YBYP 50000mAh Cable Bank, and OHOVIV 50000mAh Cable Bank are explicitly not allowed on airplanes. The INIU 10, 000mAh models, Zmmyuluo, and Anker 25000mAh Laptop Bank are described as airline-safe or carry-on friendly.
A bank that cannot board your flight is not a travel solution, no matter how many charges it stores.
Check the watt-hour marking and current airline guidance before flying. Batteries belong in carry-on baggage when permitted, not checked luggage.
Frequently asked questions
How much capacity should a portable charger have?
A 10, 000mAh bank is suitable for everyday phone backup and usually provides around one to two phone charges depending on the device. Choose 20, 000mAh for several charges, tablets, or a weekend away. Larger capacities are more appropriate for extended outdoor use or emergency preparation.
Can these power banks charge a laptop?
The Anker 25000mAh Laptop Bank is the clear laptop-focused model because it has three 100W USB-C ports and 165W total output. The INIU 45W models can support some higher-draw devices, but laptop compatibility depends on the laptop's charging requirements. The other products are better treated as phone and tablet banks unless the device specifically supports their output.
Which models have built-in cables?
YBYP, OHOVIV, Zmmyuluo, and Orfeika include multiple built-in cables. The INIU 45W Mini 10000, INIU 20000mAh Mini, and INIU Ultra Mini 10000 each include a built-in or attached USB-C cable that is detachable. The Anker PowerCore Slim 10000 uses a separate cable.
Are the largest banks allowed on airplanes?
No. The ZZI 60000mAh Power Bank, YBYP 50000mAh Cable Bank, and OHOVIV 50000mAh Cable Bank are identified as not allowed on airplanes. For air travel, use a model described as airline approved or carry-on friendly and confirm the current airline rules before departure.
Is 45W better than 22.5W for a phone?
It can be, but only if the phone and cable accept the higher rate. A 45W bank also has more headroom for tablets and gaming devices. For an ordinary phone that does not support higher input, a 22.5W bank may provide similar real-world charging speed.
Do built-in cables wear out?
They can, just like any frequently bent cable. The INIU models have a useful advantage because their attached USB-C cables are detachable and replaceable. Banks with permanently integrated cables are more convenient at first, but a damaged cable may be harder to work around.
Can a power bank charge several devices at once?
Yes, several products here are designed for simultaneous charging. ZZI supports up to five devices, YBYP supports up to five, OHOVIV and Orfeika support up to six, and the Anker 25000mAh Laptop Bank supports up to four. Charging several devices at once can divide the available output, so simultaneous connection does not mean every device receives the maximum wattage.
The bottom line
The Best portable charger power bank for most people is the INIU 45W Mini 10000. It is compact, airline-friendly, fast enough for phones and several larger devices, and its detachable USB-C cable avoids one of the common long-term weaknesses of integrated designs.
Choose the Anker 25000mAh Laptop Bank if a laptop is part of the plan, or the INIU 20000mAh Mini if you want several phone charges in a more manageable body. For camping and outage preparation, the ZZI, YBYP, and OHOVIV provide far more reserve, but their airline restrictions make them specialized choices.
If you are undecided, buy the smallest bank that provides the number of charges you actually need, then prioritize output and cable compatibility.
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