Moisture is the enemy of survival and fishing kits, as well as other items that can rust when stored. These Silica Gel Desiccant Packets are the ideal solution for adding to all survival and fishing kits, especially those sealed in a tin. We now enclose the small 1 gram packet free in all of our survival tins. These moisture absorbing packets are packaged in Tyvek which makes them tough. We offer them in three sizes; 1 gram for small kits and tins, 5 gram for medium kits (such as our Survival Kit Pouch Plus™ packaged in a medium Pelican Case), and a larger 1 oz. for those really big kits. We also use the 1 oz. for food stored in 5 Gal. buckets, as they meet FDA specifications for food and drug products. These packets are cheap insurance for protecting your valuable kits and items!