Material: PVC Internal Capacity:42 L Waterproof Size: W: 9.5 cm , H: 45.5 cm , D: 16.5 cm Strong and Lightweight Side Reflectors Padded Straps Includes a Laptop Case Internal Key ChainSOPHOS dry bag rucksacks are made from strong, lightweight water-resistant fabric featuring waterproof heat-sealed seams, a roll-top opening, side reflectors, side pockets, and adjustable padded straps, designed to ensure your gear is protected from water, sand and dirt. It is a great asset to have when hiking and camping as it keeps your gear more compact, fresh and dry. It also includes a laptop case which attaches to the inside of the rucksack so you can carry your laptop wherever you go without worrying about it getting wet. Its design makes it comfortable and convenient to carry around due to the padding and weight of the backpack distributed evenly across your back.