My husband bought this pack to take with us on our honeymoon to Spain.  Although the price was steep for a small backpack, we wanted to be sure his camera and whatever stuff we were carrying on a daily basis were safe.

It is a great size. Not big and bulky like an LL Bean backpack you carried your school books around in back in college.  It is not so small that you have to squish your stuff in there, either.  Here is what we packed each day:
Full size Canon digital camera in a carrying case
Cardigan sweater
Bottles of water (2)
Assorted maps, papers, and purchases we made during the day

I like the clips to make the zippers nice and secure.  I also like how the main compartment zippers are kind of hidden down in the bottle holders.  The outside compartment is pretty snazzy because you can lock it down or not - you choose.  But it is handy for putting stuff that criminals generally do not want like Cheetos, gum, and directions to the museum.  When we took a break to eat it was super cool to be able to unfasten the right strap and then wrap it around the table leg and fasten it back.  The twisty-lock mechanism is sturdy and we felt it was secure.

Now that we're back from our trip, the pack is the perfect size for a weekend out of town.  It will be handy to have when we go to Mardi Gras in New Orleans next year and when we go to NYC.  Really great product.  The size and performance was well worth the money, but the peace of mind was priceless.