I can understand the concern about a fixed blade. Rather frightening item to have on your belt in a snowmobile crash. Still, it's worth having some essentials in your pockets or attached to your person; that's all you can really be sure of. I guess that would be even more true if you were crossing frozen water on your tour.

A big Leatherman like the Core would give you strong pliers along with a couple of decent-sized blades and a passable saw. Also, these are unlikely to open up in a spill (yikes!). I like mine, despite its honking size; it's a real tool for real work.

Or, consider the big Victorinoxes with the locking main blade and big saw. (These are ultimately a first-rate saw with other useful attachments thrown in.) A light and effective tool in the field IMO.

My $0.02.