I got this bag for a month long trip to Greece.  It was perfect and I used it the entire trip.  It is so easy to change from shoulder bag to back pack...nothing to reclip.. just pull the straps.  It has plenty of pockets and compartments to keep a camera handy.  The size is great.. can handle all one needs for a day trip (water bottle & suncreen, etc).  The material is nice and does not get too hot against your back.  I like the wallet that clips inside with a little elastic "leash" because it makes it difficult to be the victim of a pick-pocket.  It is rather expensive, but I was very happy with my purchase.  I would love to get some other colors.