Like their non-psychoactive relatives, fresh psilocybin mushrooms should be stored in paper or perforated plastic. Magic mushrooms can stay good in the fridge at 35-40°F for up to two weeks on average. Paper absorbs the mushrooms’ excess moisture, whereas plastic traps it, which causes the mushrooms to become slimy sooner. https://tellstoneronnie.com/how-to-store-magic-mushrooms/