Bought to use for longer training-runs, whilst not wanting to pay the considerably higher prices for the more specialist running brands.
I have had it now for 1month and have used it in sunny and rainy weather, I am impressed so far.
It feels well made, with padding in the right places. It fits comfortably in the small of the back whilst running and the belt only loosens a small amount, and tightens again easily. 2 other straps are easily tightened to ensure the pack is as snug as possible to your body.
The pack holds the 2 supplied water-bottles very securely; fairly easy to remove whilst running, but more difficult to put-back.
There is one capacious zipped - but not waterproof - storage space (It easily holds my lightweight ripstop jacket + banana + chewing gum: I have run 8 miles with 1/2 litre of milk and a pack of sandwiches in it) within that is the key-holder and a mesh zipped pocket for money etc which is very useful. Between the bottle-holders is a Velcro fastened pocket into which my HTC DesireHD (a large phone) fits snugly.
There is a carrying handle for when you have finished your run, removed the pack and want to conveniently carry it into the cafè for a well-deserved Americano.
I recommend this product as a good value and useful piece of equipment for runners.
EDIT: MARCH 12 2017
Still using it. Today on an off road marathon I had a 300 ml water bottle, my Montane jacket, Sony M5 waterproof smartphone and some snacky things. Still recommended.