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Best overall: pocket sized, charges quickly, integrated cables
There are smaller chargers with integrated cables, but this one has the best balance of features while still being small enough to carry in your pocket on the go (although maybe not that comfortably for some people).
Best slim power bank without integrated cables
If you don't care about integrated cables, this slim option (slimmer than the Jackery Bolt) fits easily into pockets while still charging quickly (2 amps) and with enough juice. Smaller options don't provide enough power for most people while not being much smaller either.
Best big power bank for 4+ phone charges
If you need more power for a longer trip or a trip with friends, this power bank has a lot of juice in a fairly small package with fast charging speeds. You could fit it into a bigger jacket pocket, but it's probably better suited in a bag.
Best option for charging more power hungry USB-C devices like laptops
Until a short year or two ago, charging bigger devices like MacBooks or Nintendo Switches required you to plug into a wall. However, today there are larger power banks with higher wattage that can now let you take these devices anywhere so you can be truly untethered.
This power bank from the ever reliable RAVPower can push 45W to USB-C devices, which is as high as it gets today and means it can charge any MacBook except the largest 15" Pro at full speed.
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The world uses over 15 different plugs and sockets. Ensure your devices work anywhere with these adapters.