How big a kit do I need for camping?

Match the kit to group size and trip length. Adventure Medical Kits labels its Ultralight/Watertight line by capacity: the .5 covers up to 2 people for 2 days, the .7 up to 3 people for 3 days, and the .9 up to 4 people for 4 days. For large groups or long expeditions, the Sportsman 400 is rated for 10 people over 14 days. Solo ultralight hikers usually prefer the smallest watertight option to save weight.