Mammut Creon Light Backpack - 40L Dark Spring/Iron The 4 STREAM system eliminates all the disadvantages of existing air space suspension systems: Rising hot air can escape upwards, resulting in a "chimney effect", the balance point is closer to the body, packing is easier 32 and 45 liter volumes allow simple adjustment of the 3-level suspension system to suit the length of the wearer's back 32 and 45 liter volumes equipped with a height-adjustable flap with internal and external pockets, 25 liter version with flap stitched in place Side zip access to the main compartment 1 large stretch front pocket