Great Hydration Pack
I bought this pack a while ago and use it 3-5 times a week. I love the flexibility of the bag (although it is meant for MTB, I take it hiking as well), it has plenty of room for what I use it for.
One of the best parts is its warranty, a thron bush put some holes in it while I was hiking. I called them up, paid for shipping and they had it repaired for me and shipped right back.
Great bag, great customer service. All my bags from here out are going to be Osprey.