Mi Power Bank 3 Ultra Compact 10000mAh 22.5W

This is the anti-feature-creep pick: no LCD screen, no wireless pad, no multi-port fast-charging matrix, just a genuinely smaller 10,000mAh cell at a lower price than most competitors in the same capacity tier. For someone who just wants a phone charger in their bag and doesn't care about specs beyond that, the smaller size and lower cost are the whole value proposition.

The Anker Nano 5000mAh is smaller still but holds half the capacity; the Mi Power Bank 3 Ultra Compact is the better choice when 10,000mAh is genuinely needed (roughly 2 full phone charges) but a large brick-shaped bank isn't wanted. Compared to the Nitecore NB10000 Gen 2, which achieves a similarly compact footprint through an expensive carbon fiber shell, the Mi bank gets there through simple plastic and a lower price instead.