A multifunctional professional backpack with individually adjustable compression straps for flexible attachment of gear. Additionally, the backpack made from bluesign-certified main material offers extra storage in the removable hip fin pockets. A water bottle fits in the fold-out pocket. The various volume sizes of the Aircontact X can be optimized to the individual size of the wearer through the adjustable back length of the VariSlide system, the precisely fitting VariFlex hip fins, and the movable ActiveFit shoulder straps, making it comfortable to wear thanks to the large Air Spacer Mesh.