How do I tote my gear? Let me count the ways . . .
Domke F-1x holds most everything (D60, 20D, 15-30, 24-70, 70-200, 100-400, 35, 90, 420EX, 550EX, 580EX, couple of 12" Litediscs, spare cards, spare batteries, polarizers, ND grads & Cokin P holder, lens cleaning stuff, the odd TC, cable ties, and a bunch of other stuff)
Domke F2 holds most of the above, just not all the flashes and I have one camera out
Adorama Slinger - 1 body, 24-70, 75-300 IS, flash, 35, 50, or 90, batteries, cards & junk
Slinger Pro - 1body, 24-70, 70-200, 100-400, flash, batteries, cards, junk
Domke F-7AF - same as F-1X except I can have both the 70-200 and the 100-400 on bodies and vertical in the bag. It's deeper, but not appreciably bigger otherwise.
Couple of backpack combos of varying sizes, but I rarely use them - they're impossible to work out of unless you have a place to put everything down securely.