A 53-piece first aid kit in a rigid latching hard-shell case.

The middle size, and the one that fits most vehicles. Nearly double the contents of the small kit for five dollars more, in a case that still goes in a glovebox or a door pocket.

Hard shell means nothing inside gets crushed, and the latch means nothing spills when the case ends up upside down under the seat.

A sensible default if you are buying one kit for a vehicle and want to stop thinking about it.