Think Tank Glass Taxi, Convertible Backpack / Shoulder Bag for Large Lenses with Camera Attached.
The Think Tank Photo Glass Taxi is a modular convertible backpack/ shoulder bag that will hold large lenses or a camera system. Holds up to a 500 f/4 lens, 300 f/2.8 lens with SLR attached, or SLR with 70-200 attached with hood in position.