Check out the dakine pro II, there is no water bottle holder, but its still a solid backpack. i use it for school, skiing and travel. for school, ill usually have a laptop and a couple of binders. comfortable to carry. for skiing, ill have my 7d, 70-200, 18-135 and 10-24. ill have room for a gatorade bottle and sometimes ill squeeze an extra layer in there. for travel, ill have a laptop, camera and lenses, wires/chargers, and some other miscellaneous stuff.
the awesome thing about it is that it has a very slim profile as well, so the weight isn't tugging at your shoulders super hard like some of those absurdly fat bags.
around school, i also see a lot of oakley, under armour, and north face backpacks. might wanna check those out, but i lvoe my pro II.