Think Tank Glass Taxi
Convertible backpack/ shoulder bag that will hold large lenses or a camera system. Holds up to a 500mm f4 lens, 300mm f2.8 lens with SLR attached, or SLR with 70-200 attached with hood in position. Features self-locking YKK zipper sliders, tuck away backpack straps and a tripod/monopod attachment. Comes with interior supports for long glass, including a foam collar to stop the top of a large lens from wobbling back and forth, and a foam ring to support the lenses with smaller hoods in the bottom of the bag.
The Pro Speed Belt or Thin Skin Belt can be attached to the Glass Taxi by putting it under the hook and loop flap on the bottom of the bag. Modular and Skin components can be attached to the belt during use, and can also be attached to the front rail on the bag itself.