AJ Smollen is a photographer and all-around mountain guy who lives in Carbondale, Co and Alaska. He knows how to makes skis do his will, and can do the same thing with a snowmobile.
The WARY Avi Vest Impact by (company out of business, links removed 2015) is basically a fully featured small volume (20 liter, about 6 lbs total) backpack that’s designed to be worn more like a clothing vest than a backpack. If you’re not carrying much and figure out a layering system that works, the Avi Vest is a good safety piece for nearly any activity in backcountry avalanche terrain. Though, it you need much weight or volume capacity, you’ll want to look at full backpacks (hint, Avi Vest may have one in the works).
The Avi Vest “Impact” model I review here is designed snowmobile specific with a chest protector, but can easily suffice as a small daypack for human powered activities as well. If you’re a hybrid sledder skier, look no farther for a very nice solution to several personal protection issues.