I have a simple Canon backpack. Holds everything I need and more. When go out to shoot, 90% of the time I have an idea of the conditions I'll be shooting in, and what I'm shooting. So, I don't need to bring my entire inventory ya' know? They're very conveniently sized, and pretty sturdy. I carry a
60D, Canon AE-1, 50mm f/1.4 USM, TS-E 17mm, 24-105 f/4, and a 70-200 f/4 IS. I also have my flash, tripod, all filters, laptop in the back straps, batteries etc... it all fits just fine.