my LLBean backpack is pretty tired so im looking into getting a new bag. Being that im starting to ride to work, Id like to get a bag with either a inside pocket for my camelbak reservoir or a full out hydro pack that has some pretty good storage. I was on pricepoint last night and found they have a Hydrapak Keg for $40 which holds as much as my backpack and has a 100oz bladder. A comprable Camelbak setup would run in the neighborhood of $40-$50 more than this bag. Are these Hydrapaks worthwhile and durable? i dont want to get a crappy bag, but dont want to spend a lot doing it. Basically I need a good backpack with some h20 capacity.