The High Coast Foldsack has a simple closing system: a zip at the mouth, plus a strap with which you can buckle down the exess fabric. It is also very light: less than 600 grams despite a 24 liter capacity. Since the zipper runs straight instead of in a curve, it's easy to predict a long lifespan. - Material: recycled Nylon, 210 denier - The bottom is reinforced with extremely tough Bergshell fabric - Inner pocket for 15" computer - Side compression straps - Adjustable hip and chest straps - Zippered front pocket and two side pockets Fjällräven High Coast series gear is designed for both style and function and they will serve you in urban everyday life as well as weekend excursions.