I've used this pack on a two week trip in Eqador/Galapagos and also a 11 day trip to London/Edinburgh.  It's lightweight, yet can hold a rainjacket, tour books, souvenirs, etc while you are exploring during a day trip. However, the top back strap is now coming loose and it looks like the seam wasn't caught on the thick material, but missed.  Poor craftsmanship -- now that I am home - I believe I can sew it up so that it remains sturdy.  I do like this product and the fact that you can wash it after trips.  It fits me very well - 5 Ft 2 and I can adjust the straps if I am wearing a jacket.  Maybe I buy too many souveniers and that is why the strap is loose ;)