I am currently in the market for a good backpack in the 2200-3000 cubic inch catagoy for use as a school bag. I tend to be a bit "rough" on backpacks and have gone through traditional schoolbags (Jansport, Eastpack, Eagle Creek, High Sierra, etc.) in the past two years of collage. I have been thinking of getting an Eagle A-III backpack. Is this a good pack? If I get it is there any way I can carry a nalgene bottle straped to the outside? What other alternatives are there?