The StreetWalker Pro Backpack from Think Tank is the big brother of their StreetWalker thin profiled backpack. Like its smaller version, it still works well in crowded venues. This version holds a pro DSLR with a 400mm f/2.8 attached and its hood reversed. Or, if you prefer, you can carry your 70-200mm f/2.8 lens with hood attached and 2-3 extra lenses. You can also strap on your mono or tripod held securely in the bottom front exterior pop out cup.This is a comfortable pack with a breathable liner on the back to make it even easier to tote around. The harness is contoured with small pockets and complemented by a top grab handle for quick access out of your car or off a shelf. For added balance, there's a sternum strap that adds balance and stability while on the trail or shooting a gig. A removable waist belt makes the pack even more flexible. Access to your gear is via YKK lockable zippers that accept a user-supplied lock.Each side contains a zippered accessory pocket with an additional airline stretch pocket that is good for holding a water bottle. Under the top grab handle is a convenient business card holder that will eliminate the need to open the entire bag to give someone your comp card. The pack is backed by Think Tank's lifetime warranty against manufacturer's defects.