I think your kit is way too small for a snowshoeing trip. Think worst case scenario: 500 meters from the parking lot, it's getting dark. You fall, stupid insignificant fall, but you've broken a leg or hip. You are alone ? You cannot move without excrutiating pain. You've got to spend the night there. Temp goes down to -20C or lower or it snows....

I carry a day pack, with bivy bag & blanket, extra mits, dry socks, tuque (toque) power bars, water ... Only thing missing is a camp stove of somekind, I figure I'll build a fire (ain't gonna get any sleep anyways ...) Survive t'ill morning when hopefuly someone will come you way on the trail.