[dippasan]

I completely agree (as mentioned in previous posts) with the following as I have been snowmobiling for many years and have used these items the most:

Tow straps (Especially if you ride with Ski Doo owners ha ha)
A high quality flashlight
A saw
Leatherman Wave is a must!!
Siphon
Small tool kit
Toilet paper (ahhhhhhh)
My favorite item is an "instant on" blow torch and small propane bottle. It may be a bit on the bulky side for some but easily fits in most seat trunks or saddle bags. The last thing I want to do is to try to use matches in -10 degrees with a 20 mph wind to get a fire going.
Nothing like a 2,500 degree flame the wind can't blow out to get a fire going quick, to melt snow around nuts and bolts or to loosen a frozen track.