Not a lot to say except I bought one, liked it, gave it as a gift and bought another because it works.
The day-sack is small and robust but comfortable to ware and holds valuables and snacks in several readily accessible pockets in the two (one large and the other smaller) zipped compartments. The Bottle holder has inner strap which grips a variety of sized containers up to 500ml.
On the outside there is a reasonably secure elasticated pocket for easy access to phone or shades. Keys, documents, cash, meds and smaller essentials easily accommodated for the flexible traveller.