Hiking backpack KILPI ROLLER 40-U has a total volume of 40 liters. Therefore, it is suitable for day or weekend hikes and travel. What is interesting about it is the access to the main chamber through a roll-up lid with a zipper closure that offers a variable backpack volume. If you do not fill the backpack to the brim, it can be rolled up as needed and fastened with a plastic buckle. The inner chamber also offers a pocket for a water reservoir (not part of the backpack), with an outlet for a feeding hose. Kilpi ROLLER 40-U has a very comfortable, shaped back, padded foam construction, which allows air flow between the back and backpack. The shoulder straps are wide enough, shaped and perforated for better microcirculation. With height-adjustable chest straps, with a signal whistle and a padded hip strap, you can fix the backpack in an ideal position so that it is comfortable to wear. Two quick-access zipper pockets are located on this hip strap. On each side there is a mesh zipper pocket that lightens the construction of the backpack and holds a 1-liter bottle. There are also side straps for attaching a sleeping mat or tent and rubber bands for attaching poles. The bottom of the backpack is reinforced with abrasion-resistant double fabric and hides an integrated backpack rain cover. At the top, you will also find a pocket for valuables, which you have quick access to at any time. The total weight of the KILPI ROLLER 40-U backpack is 1000g and the dimensions of the back are 50cm x 26cm.Material composition: 80% nylon, 20% polyester