Aluminum Moisture Barrier Bags: Dry-Packs® brand aluminum moisture barrier bags are perfect to use with our Dry-Packs® Silica Gel to help prevent moisture damage to your products. The Aluminized Moisture Barrier Bag has one of the lowest Moisture Vapor Transmissions Rates (MVTR) available in the industry. These bags can be used in some of the most extreme conditions and are commonly used for storing or packaging coins, collectables, crafts, electronics, and other valuables.