Burton Sled 30L
Here's what other sites are saying:
If you and your crew head out on the snowmobiles in the morning, build a kicker and session it, then head back at the end of the day, the Burton Sled 30L Backpack would be a wise addition to your gear closet. The ultimate combination of usable features gives this pack the edge on snowmobile-accessed shred missions, and does it with serious style. At the heart of this snowmobile-specific pack is the horizontal snowboard carry that is designed to be totally out of the way while you're sitting or standing on a snowmobile. Also crucial in a backcountry pack, the Sled Pack has an easy access shovel and probe pocket in case things go bad. Extra features include dual side beverage/accessory pockets, a fleece lined goggle/accessory pocket, and hydration compatibility, all of which can be crucial during your days out in the mountains. Add in the padded shoulder straps, back panel, and removable waist belt with storage pockets, and you have a pack that can handle anything a serious day of sledding and shredding can throw at it.
Built for those who thrive on the up and the down, this daypack's board carry system lets you store a full board vertically, and also attach your "boards when they're in split mode.