I bought this to add to my Osprey Kid Carrier which came with a hydration slot but no bladder. I have an older Osprey Raptor 14 pack that I use when mountain biking, so I'm already familiar with the previous generation of this bladder. The best feature of it is the magnetic mouthpiece and corresponding clip for the sternum strap. It's so nice having a convenient way to keep the hose from dangling. The on/off function is also, IMO, better than any other brand's. The bite valve itself isn't as good as Camelbak's and seems unnecessarily complicated, but I suspect this has to do with a Camelbak patent. This has a stiff backer plate on it that helps keep the bag from bowing out agains your back when in a pack. It's a very nice feature, but it's not as stiff as the previous generation was. I assume this was to bring the weight and production cost down. This change and the zip top do make it easier to put a can of beer in the bladder, though. Fill the bladder with ice water and stash a beer in it. You'll have water on the hike up and an ice cold beer for the summit.