The Aircontact Core 40+10 backpack is a multipurpose and comfortable companion for longer trips. It is intended primarily for trekking, but everyone can use it as they like. The Aircontact back ventilation system with the new Air Spacer mesh and ventilation channel, the ergonomic waist belt and ActiveFit shoulder straps, as well as the adjustable back length predetermine this backpack to be worn comfortably in all, even extreme, conditions. A big advantage is the possibility of increasing the backpack by up to 10 liters, straps for attaching a mat or other equipment, as well as a pocket for a 3l hydro bag. The backpack is equipped with two pockets on the waist belt, a raincoat, a pocket for wet clothes, loops for attaching trekking poles and a loop for attaching glasses on the shoulder strap.