Body contact back system that provides excellent carrying comfort and places the backpack in a secure, neutral position on your back. The advantages of this system become really obvious when used during particularly active sports like jogging, cycling, climbing and skiing: you can barely feel the pack on your back as there is absolutely no movement and it sits in a neutral position on your back. Airstream is suitable for loads of up to approx. 20kg. Air circulation is somewhat limited with Airstream. Depending on its use, air channels or Airmesh netting provide adequate air circulation.