Rolltop Rucksack Mini Dune | Rains Backpacks | Watch Wear。To protect essentials from rain, fold the rolltop into a tight scroll and secure using the signature carabiner. It also features a side-access laptop pocket, front zip pocket and padded back panel. Rolltop Rucksack is cut in Rains\' signature waterproof PU fabric, engineered for carrying strength, durability, and a smooth feel. 100% polyester with polyurethane coating Waterproof rating: W3 - Waterproof protection from light rain Water column pressure: 8000mm Measurements: H48 x W32 x D11cm / H18.8 x W12.6 x D4.3 inches Volume:13 liters / 4.3 gallons Rolltop opening with snap compression, to be securely closed and fastened to protect from rain. Signature carabiner closure Single main compartment Front pocket with coated zip Padded air-mesh back panel Side-access laptop pocket fits 16\" device Adjustable padded backstraps Webbing carry handle Adjustable chest strap