A 125-piece first aid kit in a soft zip case, with a deeper supply of bandages, gauze, wipes and tape than the 50-piece.

The difference that matters is not the capability — it is the quantity. Small kits get emptied of exactly one thing (usually the medium bandages) and then sit in the vehicle half useless for a year.

A 125-piece kit has enough of each item to survive a camping season without a resupply trip, which is why this is the size to buy for a family or a group.

Still soft-sided and still small enough for under a seat.