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. Dimensions: 20"H x 12.5"W x 7.5"D (rolled) / 27"H x 12.5"W x 7.5"D (unrolled)