Just so you'll know, the Osprey bladder is different from Camelbak's bladders. The top opening of the Osprey makes it easier to get into to clean (as well as load with ice) than the Camelbak. You can fit your hand down into the Osprey bladder if you want but the narrower opening of the Camelbak bladder prevents this. You can also reach down into the pack with a towel if you like and physically dry it rather than air dry it.

The two only minor beefs I have with the Osprey is while filling it and the bite valve. It's a bit harder to hold than the Camelbak. You can use the lip on the Camelbak closure to hold onto the bladder while it fills but there isn't the equivalent place to hold the Osprey. It's only a minor issue, however.

The bite valve, on the other hand, is more of an issue. Camelbaks is simple and elegant. The hard middle bit of the Osprey is less pleasant to use.