In order to keep food cool, a hole dug into the moss in the shade and covered with a thick layer of moss is very effective, maintaining refrigeration temperature usually in the range 4 to 8°C. I use a small plastic cooler because of problems with mice getting into the items. I do not carry temperature sensitive food, but these fridges are useful for storing open canned meat, used shortening, in-use butter, fresh berries or fresh fish or game.
Stair-step Moss "Fridge" dug down to the water level of a nearby lake.
Sphagnum moss in a muskeg close to a camp. This type of moss is the most insulative.