Two phone charges for the weight of a phone
Nitecore NB10000 Gen 3
The best capacity-per-gram you can buy and it clears every airline limit without a conversation — 10,000 mAh is about two phone charges, so on a fortnight above the solar line you will still be paying a lodge occasionally.
Skip it ifA camera-heavy trip or a group sharing one bank. Take the 20,000 mAh instead.
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The rest of the shelf
Best capacityA fortnight off-grid without paying for lodge charging
Anker Power Bank 20,000 mAh
Four to five phone charges, which is genuinely a whole Everest Base Camp trek without ever paying a lodge — you carry 350 g up to 5,545 m to save perhaps twenty dollars.
Skip it ifShort treks, or anyone whose porter weight allowance is already tight.