Helly Hansen Stockholm Roll-Top Backpack Ideal for your daily commute and urban adventures, the Stockholm backpack is made of durable, waterproof fabric and has a large main compartment accessible through a roll-top construction. The roll-top closure protects against water and keeps your belongings even safer than a zipper closure. 29-liter capacity. 100% polyester. Imported. Features: Waterproof main fabric Roll-top construction with buckles Large main compartment Front compartment with zip Adjustable, padded shoulder straps