20L Lightweight Packable Backpack Waterproof Foldable Travel Hiking Daypack Material: Durable water-resistant nylon fabric. Waterproof backpack, ideal for drifting, boating or other Water Sports. Dimensions: Fold size: 9.4''L* 7.4''H; Unfold size: 18.1 ''L* 5.3''W * 13.1''H. Packable backpack make your traveling smart. Compartments: Main compartment fits up to 14''laptop; little zipper slot pocket, zipper pocket outside; two side pockets for holding bottles, umbrella. Foldable backpack with high permeability shoulder strap, make your journey comfortable. Ultralight backpack is popular for its convenient feature.