I carry a booster pack, a leathermen, a flashlight, a nifty lift, tow strap, saw/axe/shovel combo, first aid kit, hand and foot warming packs, emergency snacks and water, and don't laugh a tampon. Plus some other bits and bobs.
The tampon can be dipped into the gas tank and used as a fire starter.
The guys all ridicule me for carrying so much, but guess who they turn to when there's a problem/
brian