these are great for your PSK.
i use several of them .
one contains a small fishing kit.
one contains a small first aid kit
one contains a h20 procurement kit. (h2o tablets, 6 condoms, 12 inches of fish tank tube for a straw)
one contains a fire starter kit.
one contains a sheet of 2 mil poly (plastic) and 4 pcs. of string for shelter.
all of these tins fit perfectly in a sports bottle holder and clips to my lbh or belt or pack. only problem with them under certain weather conditions the are not water proof so i keep the in a freezer type ziploc bag in the pouch.
hope this offers some interesting advice.
good luck
woodsman