Not sure what you're looking to carry but I've been very happy with my Scout bag from Eagle Creek. I just spent 3 weeks in Europe and carried it every day. It holds MUCH more than it looks like and gives multiple carry options including a nicely padded waistbelt that hides away (I haven't used that yet as I was carrying way too much- I used the shoulder strap). I carried all kinds of my preparedness "junk" (lights, sewing kit, compass, knives, foodbars, mints, gum, etc., etc.,) plus a magazine (for waiting) plus maps, guidebooks and a translator, a fairly large camera (Canon XS10is) and had room for more- in an amazingly compact and easy to use package. It also has 2 mesh pockets for water bottles which was the reason I bought it. It has turned out to be much more useful than I had expected.
Warning- it's not going to look that big in the store, you're going to have to play with it a bit to get an idea of what it will hold.