I love my old osprey 3l. It has the 3/8 tube and when I need water it comes out like a garden hose. Don't always fill it up all the way but it is nice to know it is there in dry stretches.

Last big section I tried the platy 2l. It had a hard time getting water out of it, as well as there were times I thought it was empty but there was still water in there, was no fault of packing.

The Osprey was more comfortable with the backing and I could always feel the tube of the platy against my back. The platy is the SL I believe which is not made anymore. The osprey has gone to a 1/4 standard hose as well.

Osprey is heavier but when I want water I get it. Never tried a camelback.

My two cents