I'm no rando racer, and I want my backcountry skiing packs to be burly enough to last and have the features that I really use. Here's my list of useful features (in no particular order):
-A-frame or diagonal ski carry
-insulated (in the shoulder strap) hydration tube routing
-Avy gear pocket
My few complaints are that the straps are all way too long. You're going to want to break out the sewing machine and a knife to shorten these up. Also, the design would be a lot more elegant if it didn't have like, 700 little pockets to store random straps. Snowboard carry system, I'm looking at you. Also, the shovel pocket is a pretty tight fit for my G3 Avitech shovel and Tech probe 320.