Super rugged transparent polycarbonate housing resists impacts without shattering. Innovative patented design so you can open and close the lid without tools. Extra wide, rain proof opening provides full access for loading, unloading, and finding items. Built in guides keep tie down straps in place so extra carrying case is not needed to attach to backpack. Larger capacity for the space you need and lighter for backpacking when every ounce counts. Grizzly & Black Bear Approved!