A 121-piece first aid kit in a rigid latching hard-shell case — the largest of the Lifeline hard-shell line.

Four times the contents of the 30-piece for three times the money. If you are buying one kit and you have room for it, this is the one that makes arithmetic sense.

Deep enough for a group trip, an expedition vehicle, a trailer or a shop, and rigid enough to be stored anywhere and ignored for a year.

Check it each spring and restock what went missing. That habit matters more than which kit you bought.