Not sure exactly what you are looking for, but for your price range it is hard to beat LA Police Gear's packs.

They are heavy but they are very durable and are "tactical" packs for whatever that is worth. Very similar to my Maxpedition packs at a much better price point.

3 Day Pack

I have one of these and the webbing allowed me to attach 2 bottle holder pouches as well, so it would then meet your water carrying capabilities. It is a 2500 ish in^3 pack, so it holds quite a bit. They also sell a 3000 ish in^3 pack for about $50.

I have gotten quite a bit of good use out of mine and it still looks brand new. I don't think my kids could even scratch it.

Good luck in your search!

Greg