- The Purik scores a clean look with its hugging shoulder straps and surprisingly spacious interior. With 21 liters it offers a lot of space. Your 15" laptop is protected from scratches in the padded laptop compartment. The front compartment has room for a slim agenda or book and the key ring shortens the annoying search for your key in the depths of the backpack. The pen holder does not let you waste a minute to write on something.