Why do you guys carry lockring wrenches and cogs around every day if you're commuting the same route every day? If you're tired, you can't just toughen it up and get the rest of the way home?

Anyways, when I'm at school I carry something like:

1 13" MBP in a sleeve
3 single subject notebooks
2 plastic folders
1 TI 86
1 iClicker
2 mechanical pencils
2 Uni Ball UM 151s
1 eraser
1 pack of gum
1 iPod nano
1 pair of Shure SCL4s
1 15mm wrench
1 U lock

And sometimes:
1 laptop charger
1 cable
1-2 textbooks, if I'm feeling studious
1 Klean Kanteen
Cheezits

I'll take a picture if I get back to school and this thread is still alive.