I object! It's not all crap!

All I generally have with me is:

LED flashlight with headband
Keyring with about 30 keys, and tritium glowstick
Wallet, containing credit cards, debit cards, both driving licenses, magnetic sensor card, IR sensor card, many old cards I don't use any more, stamps, business cards, and occasionally money
Inhaler just in case
Aspirin, paracetamol, ibuprofen, antihistamines (I get hayfever)
Camping set of salt and pepper
Several sets of disposable latex surgical gloves
Small multimeter
Bluetooth headset
Phone
Coins
Cheque book
Sometimes business cheque book
Toolkit containing gas soldering iron, solder, screwdrivers, small adjustable spanners, two tweezers, cable ties, wire cutters, wire, spare battery for the meter, heatshrink tubing, flux pen, self-adhesive velcro, rubber bands, scalpel, etc
Some strong paper towel
Lighter

That's not much, is it? It still leaves several pockets empty for job or situation specific items such as PDA, various cables, water purifier solution, glowsticks, batteries, memory cards, lenses, binoculars, sunglasses, camera, and so on.

My trouser pockets are usually empty though. I don't like weighing myself down

pca