An unopened letter I’ve picked up on the way out of the flat and keep forgetting to read.
Cigarettes
Lighter
Box of matches (having thought I’d forgotten my lighter the previous day only to find it in my trouser pocket)
Pocketwatch (usually with one of several infuriating faults)
Phone (with essential built in camera)
Chewing gum (usually one solitary piece I can’t bring myself to eat, wrapped in the oilcloth of what once was foil)
Loose receipts (v useful for used chewing gum in no-bin situations)
Wallet (quaint affectation these days)
Keys (occasionally with TARDIS key)
Loose change (usually 2p pieces I’ve seen and picked up for luck. Tuppences are lucky. Pennies are not)
I don’t like bags, you see. A good coat with lots of pockets is like a best friend you can share a bed with. You do everything together, and they carry the components of what makes up your universe.