Heres my recomendation. This is what I did, I bought a cheapo brand hydration pack from target. It was around 20 bucks. Throw the water insert away and buy a 20 dollar 100 ounch camelbak insert. My pack literally has tons of room, I mean its a regular size bag, and I get the quality of the camelbak insert. Thats all you need, the pack really doesn't need to be camelbak.

Heres the exact one I have, but I bought it for 15-20 dollars. At least 2 years ago. Even at 30 dollars+ 100 oz camelbak insert it will be 50 dollars.

http://www.target.com/gp/detail.html...sin=B0000DH9Y7