I can't carry too much stuff in my car, because of work even though I have to do silly thousand miles a year, and there are times when I collect 4 people, with a boot full of luggage. All my stuff has to be in the door pockets and underneath the boot in the spare wheel well:
In the car:
Gloves
TomTom
Mints
Business Cards
AA Greater London Atlas
Philips Motorists Atlas (cheap one from 99p store)
Marker Pens and a ream of Tesco Value paper (for meet & greets)
1 x £10 note, 1 x £5 and some pound coins (float)
Lost property: a pair of gloves and a comb
Some crayons a child left behind
Calculator (if someone wants to pay me in Euros or Dollars)
Some leaflets on London (mainly for tourists who are here for the first time)
A couple of hangers (if I, or the passengers want to hang their jacket)
In the boot (tucked nicely to one side):
High visibility jacket
Large piece of old carpet, and a big bag of cat litter (in case I stuck in snow)
Under the boot, in the spare wheel well:
Torque wrench, extension bar, 17mm socket (the wrench which comes with the car is far too short and useless)
Tow rope
Air freshener (aerosol)
Spare bulbs
Interior wipes
Black & Decker mini vacuum cleaner
Gloves (rugged type)
Philips Atlas, the big one with the 1.5inch to 1 mile scale.
Glass cleaner
Another hanger
Also I bring with me a bag to carry my laptop in, and a power inverter.
All I need for a day's work!
- oh yes and on the rear parcel shelf, a Mercedes umbrella and tissue boxes.
Everything is out of the way, no clutter, car is always ready for a load of passengers with their luggage!