With reinforced PVC construction and welded seam zips, this bag is equally prepared for precipitation or summer rays. The roll-top closure allows the backpack to right-size to your contents, while sealing out the weather. Its adjustable shoulder and sternum straps offer flawless fit and comfort for the journey ahead. 100% Waterproof Sealed Seams. Durable Reinforced PVC Fabric. Roll-Top Closure with Adjustable Straps. Ergonomic, Adjustable Shoulder and Sternum Strap. Large Waterproof Pocket. Contrast Zipper and Webbing. 25 litres.