The black/gray Glass Taxi Backpack from Think Tank is one of those "wow" bags that doesn't come along often. Here's a bag that's not only designed to be used as either a backpack or shoulder bag but that will accommodate your pro DSLR with a 300mm f/2.8 attached. Or, if you prefer, it will hold the camera with a 500mm f/4 lens. On a daily basis, it will hold your DSLR with one lens attached (like a 70-200mm f/2.8) and three additional lenses.
This kind of convertible pack delivers dual functions and saves you the trouble of having to buy two separate bags. The tuck-away backpack shoulder straps permit you to just use the Modular Component Strap for traditional shoulder use. This Curved Comfort Shoulder Strap is well-named. The shoulder straps can be hidden by simply disconnecting the D-Rings. Inside the pack, there's a foam ring at the bottom that is not only used to cushion your rig but will hold the lens in place. There's also a foam collar that secures the back end of the lens providing even more internal stability. The pack is also capable of holding a monopod in either of its side stretch pockets. However, if you prefer to carry a traditional tripod, side straps are provided.
The Glass Taxi accepts Think Tank's optional Pro Speed Belt or Thin Skin Belt that permits you to attach even more components to the pack. In support of that, there's a front rail that will hold modular attachments such as Think Tank's Chimp Cage for holding an additional DSLR body.
A top grab handle is for quick grab moments and contains a clear business card holder underneath it. This will eliminate the need to open the entire bag to hand out your card. An inside mesh pocket is used for small accessories like lens caps, cleaning cloths or Think Tank's Pixel Pocket Rocket that will hold ten CF cards or more business cards. Finally, for complete protection, Think Tank includes a rain cover for the entire pack. This pack is backed by Think Tank's lifetime warranty against manufacturer's defects.