Some cool backpack images:
backpack
Image by sparky_vision
The contents of the backpack, minus the magic box that allows me to pull anything I need for any given situation out of thin air.
From (roughly) top to bottom, left to right.
1. Wegner Gear backpack. The heart and soul of the whole operation.
2) Various pens.
3) Various Sharpies. The little ones I got myself, the big ones were a gift from mom² and my little sister Eva.
4) Lighting folder which contains a set of French curves, lighting tech sheets, set lists, and patch sheets.
5) Current Rose Brand and Dazian Fabrics catalogs.
6) Sewing kit.
7) Gel swatchbooks, Apollo and Rosco. 
Laptop / iPod power.
9) The Pocket Ref. Everything you need to know in life, and then some.
10) Moleskine notebook for set / lighting design ideas.
11) Bag for misc cables / adapters.
12) Bag for DMX / audio adapters.
13) Sekonic L-558 Cine light meter.
14) Various notebooks for audio, lighting, general, and sketching.
15) Artwork box with markers, Liquid Paper, pencil sharpener, sketching pencils, and kneaded erasers.
16) USB floppy disk drive.
17) Calculator.
18) Basic first aid kit.
19) Surefire G2 flashlight.
20) Bandit Technical Reference Disk.
21) China marker.
22) Replacement Surefire lamp.
23) Laptop screen cloth.
24) Small Fuji camera.
25) iPod
26) Mechanic’s gloves. (My SetWears are in another bag.)
27) Box of Lithium 123 batteries for flashlights.
28) Tube of Superglue.
29) Passport.
30) Crappy ear buds.
31) Various USB thumbdrives, WYSIWYG dongle, and Calibug.
32) Sunscreen.
33) Tin of mints.
34) Fluke distance meter / laser rangefinder.
35) iPhone 3GS.
36) Surefire E2L LED flashlight. (worn on left hip.)
37) Gerber knife.
38) Leatherman Wave (worn on left hip.)
39) Set of earplugs.
40) Logitech travel USB mouse.
41) 15-inch MacBook Pro.
Backpack
Image by slgckgc
Tamrac Expedition 3 Photo Backpack