I wanted a pack for hiking but what I was mostly concerned with is the water bladder itself. The bladder (2L) is awesome. I've had the ones that have the screw on lid - which are good, but a pain in the rear end to clean. This one has a slide locking mechanism on the top that you just slide the clip off and the entire top of the bladder is accessible for cleaning, it's freakin' sweet!
The pack itself it excellent. Really heavy duty and I can fit quite a lot of things in it. My last day hike I was able to carry a large hardback book, a snack, my hammock, med kit, leather man, fire steel, iodine tablets...and the list goes on.
I have zero complaints about this item. You shant be disappointed if you buy. It's a great pack for a great price. Most of the Camelbaks I've seen are double the price with less space, and IMHO, a terribly designed water bladder.