Normally what I carry on all trips

Winter time,
I always pack my polypros, AMS Bivy sack, Ski cap, extra socks and clothing, ski glooves, head lamp, and an extra lighter in my bag.

In teh car I have food, sports drink, FAK, insulated boots, road signal kit, Gerber LMF II which has my PSK strapped to it, and the usual car gear.

In the summer I DX the polypros and other cold weather gear and repace them with a waterproof jacket.

If I go off roading, or in to more remote areas I'll increase my gear lists to suit the threats.