Cotton Carrier - worn on the chest it allows me to be mobile while packing a camera.
Custom USB thumb drives by USB Memory Direct I store portfolios and image files on them and give them away. The one I now have is a real bottle opener - my clients keep it handy!
Panasonic Eneloop Professional rechargeable AA batteries. Panasonic finally figured out how to make rechargeables that hold a change and have more power than standard alkaline! After a year, these batteries still have 80% of their power!
Eyelead Sensor Cleaner. Nothing I've ever used works better or is more simple to use one you know how to use it. It’s tricky, but it’s worth it!
Custom 100% cotton rags. Old high-quality bed sheet torn up to make rags.
Large gear twist ties - these things are cool I use them to secure things to my pack and to hold small flashes to branches or poles.
Portable micro tripod. Usually used to hold a flash, I couple it with the gear twist ties when needed.
Corded mini charger strip with USB ports. Enough said.
Two types of outlet converters so no matter where I go around the world I can get juice.
Headlamps. In every box or bag I own. I like Petzl, but you can't go wrong with the cheaper Princeton Tec.
Extra caps for lenses, and camera.
Handheld luggage scale. This is the one I use, it’s been all over the world and still works great!