It's great to see how everyone else carries things. It gives me good ideas.
I carry different bags for different purposes. My regular everyday bag is a Swiss backpack, which holds my laptop (when I bring it), books, files and a variety of pens, business cards, etc. It's really bigger than I need, but every now and then that comes in handy.
I always have my keys (with Photon LED light and Pico USB 4GB flash drive... both tiny), wallet, Leatherman micra and a Buff in my pockets and my HTC Touch in a holster case on my belt. (I don't care if it's not cool any more; it works.)
When I travel, I use a Pac-safe Daysafe100 backpack and I put an Eagle Creek Drifter in the top with things I want at my seat on the plane. Then I pull the Drifter out and put the Pac-safe in the overhead compartment. The Drifter is also great for a casual trip out when you don't want an entire day pack. In the Drifter, I keep my Fujitsu Lifebook U820, a laptop Bluetooth mouse, a pen/stylus, a microfiber cleaning cloth, earbuds, passport, money, credit cards and a few toiletries like a small bottle of saline and a Blistex. (I don't carry a wallet when I travel.)
I also use the Drifter at home when I want to carry my Lifebook with accessories, though I usually take just the UMPC itself without the case.
I have a Port rolling computer bag which holds everything except my iPhone 3G. It stays on my hip. I always have the bag with me when I'm working, whether in town or out of town. If I'm not working, the iPhone is the only thing I carry. The bag holds:
Lenovo Thinkpad T61
Targus universal power supply with several tips
Zen VisionM 60GB
Zen 32 GB with 16GB SDHC card
usb power supply
power supply for Zen VisionM 60GB
Kensington backup battery for iPhone
Canon Poweshot SD750
Plantronics Bluetooth headset and charging adapter in case
Logitech Quickcam Pro for notebooks
Western Digital My Passport Essential 250GB drive
5 usb flash drives
Zip-Linq retractable ethernet cable
retractable usb to mini usb cable
Shure E3c earbuds
video cable for Zen VisionM
3.5mm to dual RCA plug cord
3.5mm to 3.5mm patch cord
spare sunglasses
Leatherman multi tool
several pens, highlighters and a mechanical pencil
LED light
After typing this list, I looked at it to see if I really need all this stuff and, surprisingly, I use most of it every day.
In the trunk of my car, I have a gym bag with a bunch more stuff I use less often -- a 12V to 120V inverter, a KVM switch, a couple of VGA cables, a usb to DVI adapter, a DVI cable, a bunch of audio patch cords with different connectors, a pouch with a bunch of connector adapters, and other random stuff I don't recall and am too lazy to go out to the garage and look at.
I have a Targus backpack that I have my work laptop, a spare phone, thumb drive, ziplock bag with the normal cough drops, cold medicine, etc., headphones for my iphone, headset for my ip phone, lan cable, a notepad and pen, spare laptop lock from roadwired, led flashlight. iphone,keys, and wallet go in the jeans pockets. If I travel anywhere over the weekend, the backpack has enough room for a couple changes of clothes and extras.
Here is the junk I usually have with me on a daily basis. (work day that is)
The bottom row all goes in my pockets, tissues, wallet, pager (yes i still have a pager for work. I refuse to give them my mobile phone number.), hair ties for windy days, chapstick, 4gb flash drive, and my keys.
The rest I carry to and from work in a cheep swiss army bag I found at Target.
Redfly, my old cingular 8125 (for testing software), boxwave hard case for my TyTN II, Plantronics 855 bluetooth headset, PPCtechs adapter, lilsyc cable, USB wall and car chargers, stylus/pen/pencile, Dlink bluetooth USB (work computer doesn't have bluetooth), and an assortment of flashcard adapters and readers and my old flash drive. Oh and a water bottle. (don't drink the rust colored water at work.)
That is my kit.. other than my TyTN II which I used to take the picture. I probably could drop a few of the flash card apapters now as I don't use many of those cards any longer. I usually have my wired headset for my TyTN II in there but I think I forgot it at home. I cleaned out the bag for a weekend trip this past weekend. Must have missed them.
I used to carry a whole lot more junk around with me. Had an entire back pack full of stuff. I decided that I really didn't need most of that junk on a daily basis and forced myself to cut back. I should probably get rid of some of this stuff too.
I also have a Scott e-vest but don't use it as a "bag" very often. The weather is to random here and I still can't get into using it as a bag. When I go to lunch I really don't need to drag all this crap with me. That means I would have to load and unload it every day. The e-vest is champ though on trips and vacations.
I have a 17" Targus Laptop Bag ( I had to pull out the divider so my notebook could fit) that carries:
Sony Vaio 18.4" notebook
Western Digital 500 GB external hard drive
80G Zune
Verizon Broadband Express Card
Samsung Omnia 8GB version (when not on my hip)
2 thumb drives
Flashlight
Checkbook
Spare Keys
Medicine
Letter size binder
Various adapters and cords