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. Product Features: 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, 100% PVC with 100% Polyester Lining, Size: 20.5" H x 12" W x 6.5" D (when rolled down)., VOLUME: 25 Liters / 1,525 Cubic Inch. Colours: Black/Dolphin, Royal/Black