Arcteryx nozone 55 backpack the arcteryx nozone 55 backpack is a mid sized climbing bag designed for traditional alpine treks with a large main compartment with drawstring and clip top fastening twin removable aluminium stays for support two padded adjustable shoulder straps top grab handle extendable collar four compression strap key clip zip pocket to lid mesh pocket and arcteryx branding to finish backpack large main compartment drawstring fastening clip top fastenin