I have a BRAND NEW, never used Black Diamond Covert Avalung Ski pack I need to sell. Retails for $259, and I am selling for $120. It is a size M/L and has a capacity of 30L and here is BD's description:

Optimized for sidecountry laps and day-long backcountry tours, the Black Diamond Covert AvaLung stores everything you need for day-to-day off-piste travel and increases your chance of survival in the event of an avalanche burial thanks to its built-in AvaLung. Our innovative ergoACTIV suspension keeps the Covert AvaLung stable on the skin track or an aggressive descent, and the spacious interior organizes your avy tools, plus has enough room for lunch, layers and skins. When you hit the ridgeline, the tuck-away HiLo helmet holder and diagonal ski carry cable keep everything in check.

ergoACTIV suspension with SwingArm shoulder straps
Large zippered front-panel opening
New diagonal ski-carry cable, plus A-frame carry option
HiLo helmet holder, hipbelt stash pocket and fleece-lined goggle pocket
Dedicated avy-tool organizer pocket and ice axe attachment
Insulated hydration sleeve