7 mil thick mylar zip seal bags are the wise choice for long-term storage of freeze dried or dehydrated foods. Don't take chances on the protection of your valuable food items by using low-grade, thinner sprayed-on metal bags.Our thick 7 mil film with an inner aluminum metal layer provides the highest level of protection needed for long term storage and reduces the risk of accidental puncture due to abrasion. If you can see light through your bag film, the quality is low and not suitable for long-term storage.Use our trusted, proven, high quality bags to meet your long term dry storage requirements. Heat seal with a flat iron/hair straightener / clothes iron or simply use the zip seal as a temporary seal for short term storage. Heat sealing ensures the best long term protection.Zip seal feature gives added protection and allows for in bag rehydration of freeze dried foods with less spills and mess. The strong zip seal allows the bag to be inverted and shaken to ensure uniform rehydration.Zip seal allows for convenient resealing when you only need part of the contents; or you can partially fill the bag and close temporarily until you are ready to add more.Perfect for repacking foods from bulkPerfect for storing your own on the go meals / or do your own backpacking meals.Perfect for grinding your own coffee and storing it to preserve the fresh ground flavor.Use to preserve important documents, collections, and artifacts.Use for storing / transporting soil samples for agricultural, scientific, and geotechnical investigations We don't just sell mylar bags, we use the bags we sell and can attest to the high quality and superior performance of these bags. 2020 Pleasant Grove Farm LLC