Very useful multi purpose bag,
This review is from: Lowepro Passport Sling II Bag for DSLR Camera - Mica/Green (Electronics)
No more carrying a camera bag that says 'look expensive stuff', and gone are the days of delicately wrapping the camera up to put it in a standard day bag.
Certainly big enough to carry a days extra's (tripod, lenses, etc.) as well as a book, bottle of water...maybe not if you're a professional with lots of kit, but for a 'normal' user it should be more than adequate
Seems resilient too