Light, versatile, and small-packing, the Blocker Compression Cinch Sack pairs a fast draw cord opening with our smart compression system to ensure soft, bulky contents are easy to condense and pack efficiently in a boat or backpack, all while remaining easy to access. Versatile materials: Lightweight 70D polyurethane-coated nylon materials are a tougher, more resilient cousin to the ultralight BlockerLite materials. More durable and versatile, these materials are great for all-around use and provide dependable splash protection. Smarter compression: Unlike conventional systems that pull against seams, our Continuous Compression system encircles the sack to minimize seam strain, maximizing durability for dependable protection. Securable, easy access: Draw cord closure supplies speedy, hassle-free access to contents while the lockable cord lock ensures the sack stays cinched tight. Durable construction: Fully welded seams result in stronger and more durably protective construction compared to sewn-and-taped seams. Efficient-Packing: PackTight(TM) packing system sacks feature flat-sided, rectangular shapes that nestle closely together, packing 20% more efficiently than rounded sacks for easy, space-saving organization. Tech Specs Material - 70D nylon, PU coating Volume - 5 L, 10 L, 20 L, 30 L Compression - Continuous Compression straps Waterproof - water-resistant fabric Closure - drawcord closure Dimensions - [5 L] 3.5 x 6.4 x 11.8 in, [10 L] 4.3 x 8.2 x 14.1 in, [20 L] 5.5 x 10.4 x 18.8 in, [30 L] 6.2 x 12 x 22.8 in Claimed Weight - [5 L] 2.7 oz, [10 L] 3.3 oz, [20 L] 4.5 oz, [30 L] 5.5 oz Recommended Use - backpacking, flatwater paddling Manufacturer Warranty - lifetime