Silica Gel packaged in Tyvek meets FDA Requirements and is the industry standard for dry food packaging. When used in closed places (where mold, mildew & fungus live and breed) silica gel whisks away moisture to create a protective environment of dry air. Silica Gel is used in your tool box to protect your precious tools by removing moisture or drop some in your camera bag to protect your camera and equipment. It even protects expensive leather items like jackets, shoes, and boots. Also great for tackle boxes, photo albums, computer media storage, gun cases, ammo boxes, coin collections, camping gear, backpacks, campers, electronics, etc.