I bought this bag to take on a trip to Spain.  I wanted an anti-theft bag with RFID protection.  It is very light weight, and the slash-proof strap and bag construction, along with the cross-body style and zipper lock, gave me peace of mind that my belongings would be safe.
I was surprised at how much I could fit, with a little planning, in the bag.  My passport fit in the RFID pocket.  The pocket is no larger than passport size, but it could probably fit a couple of bank cards as well.  The second pocket (beside the RFID pocket) is large enough to hold an iPhone or a small digital camera.  The inside zippered pocket is about the size of most handbags.
In the main compartment, I was able to carry a small wallet (I tried my check-book sized RFID but it took up too much space), my digital camera, a small language dictionary (about 3x5x1"), a travel pack of tissues, a pack of gum, my travel itinerary, hand lotion, and a few other small items.
Some reviews complained that the side pockets were not large enough for a water bottle.  This is true, but they were perfect to hold a small travel umbrella on one side and a pen and emery board on the other.
 My only complaint, or maybe a wish, would be for the bag to have an outside pocket on one side.  Every time I wanted to look at my itinerary, I had to open my bag to get it out.  But overall, I highly recommend this bag.