If you can find an Osprey 55+5 pack, snap it up. I have no idea why they quit making these, but they are awesome for backcountry snowboarding and overnight trips in general. There is a snowboard carry system on the pack. There is a detachable day pack so that you don't have to bring the whole huge thing with you once you are at your spot. I've been using it for 3 or 4 seasons now. Typically once a year. I love it for hut trips.
They are hard to find though. Occasionally popping up on Ebay, Craigslist, and sometimes some Mountaineering shop will find a few.