The Black Diamond Speed 40 is a superb all round mountain pack; it is capable of carrying in heavy loads & then can be stripped down for climbing use. The clever re ACTIV carrying harness cleverly moves with your body to provide comfort & support whilst allowing you full freedom of movement. The fully padded & removable hip belt flexes to allow your hips & shoulders to move independently, which is brilliant for scrambling & climbing with a heavy pack. The shoulder straps are linked by a wire across the bottom of the pack so that they can move up & down as your shoulders flex whilst walking & climbing. This clever re ACTIV harness eliminates friction & hot spots, prevents sores & bruising & allows an unrestricted gait for maximum efficiency & reduced stress on your joints & muscles. The main body of the pack is made from the suitably tough named Nailhead 210D Nylon with a heavier 420D Nylon reinforced base & crampon patch. Twin side compression straps keep loads controlled & there is a rope retention strap under the top lid. Talking of top lids, this one is completely removable & features two zipped pockets for extra storage. In fact you can strip this brilliant pack right down by removing the top lid, removing the main webbing straps, & removing the hip belt. The main contact back area is lightly padded & features an internal wire frame & TPU sheet for stability. Designed mainly for winter & temperate climates the Speed 40 features Pick Pocket ice tool holders & ladder-lock crampon attachment. However due to its light weight & minimal design it is perfectly suitable for summer scrambling & mountaineering. re ACTIV suspension with Swing Arm shoulder straps & thermoformed backpanel Top-loading, with removable, floating top pocket, skirt closure & tuck-away rope strap Micro ice-tool Pick Pockets, three-point haul system, & ladder-lock crampon straps Removable, padded hipbelt with fixed webbing belt Hydration compatible