I'll agree with the gauze, blankets, GLOVES and ice packs. Also, given you're in Canada, how about some of the heat packs? 1 in each armpit and 2 in the groin can help maintain heat.

Ace bandages- you can't sit there holding pressure all day if there are multiple wounds.
4x4's. They're dirt cheap, and you can save the bigger trauma bandages for the real nasty wounds.
Second duct tape.
If you're comfortable, a C-collar. Just beware of the legal ramifications of leaving somone alone that you've applied a collar to.

One of these days I'll get around to posting my car's FAK.