So, everyday carry in my car and on my person.
Bag:
Keys, cards, cash, phone, pen, paper, wet wipes, tissues, three plasters, 4 neurofen, mini flat torch, swiss army knife, memory stick, discount vouchers for my supermarket (I always forget them if they are on the kitchen notice board.)
In my car
Decent first aid kit, including a foil blanket.
Fleece blanket, towel, tarpaulin, energy bars, trail mix, bottled water, black bin liners, small plastic bags on a roll, waterproof kagoul, spark-lite and kindling materials, string.
Spork and a bowl.
Spare bulbs, jumpleads, maps, WD40, wet wipes, thin rope.
In bad weather, I add a sleeping bag and a folding shovel.
In good weather I carry a picnic basket. 