The Mini Canister may be Hydrosorbent's smallest unit but it provides a lifetime of protection for cases containing guns, cameras, telescopes, and musical instruments. It is also an ideal tool for tackle boxes, silver draws, or any small storage area. The Mini Canister contains 40 grams of silica gel in a compact aluminum canister that measures 4" x 2" x 1/2", about the size of a deck of cards. Protects 3 cubic feet of enclosed space. Blue silica gel turns pink when saturated.