Constructed with heavy-duty 21 oz PVC-Free TobaTex body with a reinforced bottom of 34 oz TobaTex, the Bill's Bags will outlast a generation worth of adventures. Expandable for over 6700 cubic in of storage capacity but can be cinched down with four compression straps to compact and stabilize gear. Aluminum fasteners on the compression straps increase durability and eliminate busted buckles. The StormStrip closure system provides a confident seal and allows for easy top-loading access. Pack up your sleeping bag, plus clothes and supplies for a weekend or a week, and head out to the river. Since 1977, outfitters, guides and weekend warriors have relied on Bill's Bags to keep their overnight gear dry trip after trip, year after year.