depends what you are using the kit for.... I've got a ton of bags travel i'd use my think tank shape shifter, wedding I'd use a double sunsnipper type strap with a think tank retrospective, model shoots out doors a lowpro magnum 400 and if traveling on assignment my lowpro wheely suitcase...
what i have noticed is that i try and carry less and less on each job... ok, the back up kit is always on hand, but what i am actually physically carrying is reduced to the essentials.