Arcteryx VoLtair 30L Backpack Nylon Automotive grade, sealed locking plug allows battery removal for airline transport or hot swapping a freshly charged spare N400r-AC2 body fabric with #8 WaterTight zippers for top and right side access to the two main compartments Internal usable volumes are 20L for the Voltair 20 and 30L for the Voltair 30 Voltair 30 has a separate front compartments for shovels and probes, Voltair 20 has an internal waterproof sleeve to separate shovels and probes from the pack's contents Front lash ladders and straps diagonally carry skis or snowboard plus single ice/mountaineering tool, top compression strap stabilizes pack while carrying skis