Made from durable, waterproof, 1.1 oz silicone impregnated ripstop nylon. Provides protection for most medium to extra large packs. Adjustable elastic cord draws through the perimeter. Packaged in a reusable mesh bag. Fits packs: Pack Cover: 1,800 to 3,500 cu.in., Internal: 3,500 to 5,500 cu.in., External: 4,000 to 6,500 cu.in. Weight: Pack Cover- 1.9 oz, Internal- 3.9 oz, External- 3.6 oz. Made in USA.