well my bags not actually sealed..zippered..itsa canvas or nylon bag..but its lined on the inside and waterproof..minus the zipper..and i open and close it enough for air to get in there. the box i bought is made for fridges..the sides rip off the box and there is a cloth type bag to let the baking soda do its thing...my bag isnt airtight and sealed...but better then just leaving them lay around the truck and such..