Replying to Which backpack?

i just started high school so as you know, i need to carry my pack around to every class. right now, i have a $40 samsonite pack that has held up really well, but my stuff just doesnt fit, i cant even close it.

so i think ill sell it and buy a new one. i need it moderatly big (needs to fit 6 binders, 3 notebooks, a pair of shoes, and the occasional 1000 page textbook.
I will however, also use it for skiing occasionally this season, so optional water resevoir storage would be nice, aswell as collapsable shovel storage, and of couse ski-carrying straps.

im looking to spend less than $80 and my main concerns are comfort and storage. im so far mostly considering the oakley snow pack, and the dakine heli/heli pro.