Built into a metal card roughly the thickness of three stacked bank cards, with the charging cable folded into the body instead of a separate loose wire.
Meant as a one-time top-up rather than a full daily charger: enough reserve to get a phone back to a usable level, not to run it all day.
Slides into a wallet slot or a back pocket without adding noticeable bulk.
Includes: charging card, integrated cable, storage sleeve.