When used in closed places silica gel whisks away moisture to create a protective environment of dry air.. Put in your toolboxes to protect your precious tools from moisture. Drop some in your camera bag to protect your valuable camera equipment. It even protects expensive leather items like jackets, shoes, and boots. Also great for tackle boxes, photo albums, computer media storage and so on. Silica Gel packaged in Cotton or Tyvek is Generally Recognized as Safe (GRAS) by the FDA to be used with Dry Food Packaging.