I was in love with this bag when I saw it.  Perfect size and had everything I wanted - #1 on my list was exterior water bottle holders.  Then I read some reviews that said the holders on the side aren't big enough for water bottles.  I took a chance and ordered it anyway, because I couldn't find anything else that would work.
I am happy to report the water bottle holders ARE plenty big for standard 16.9 oz water bottles!!  I can easily slide the bottles in and out with one hand.  My 16 oz Camelbak bottle is snug in them, still fits, but it is a two hand operation.  One hand to hold the pocket open, one hand to slide the bottle in.
My husband was so happy to see that it was very 'man friendly' and he won't be embarrassed to carry it (we got it in black).  And it is a nice compact size, but still have a large back compartment that could fit A LOT of stuff in.  We are extremely pleased with it and can't wait to use it on our trip!  And I think it is such a great size I may use it all for everyday use.

The only thing I would change is to have a small pad on the shoulder strap.