I have the Lowepro Flipside 400, and at it's max it held a gripped T3i w/18-55mm, a 55-250mm, 50mm 1.4, 100mm Macro, a 320EX, a 5D3 w/24-105mm, a Tokina 11-16, a few filters and other small accessories. I also had my tripod strapped to the side.

Everything fit well and it was comfortable, I'd say its worth checking out.