I upgraded to this from using my water bottle in a side holster in my pack and the improvement is amazing. I put the bladder in an outside pocket on my camera backpack, and the hose is still long enough to reach easily to the holder on my shoulder straps. It's so much faster to take water breaks without stopping or even using hands. I haven't had any problems with leaks from the bag, hose, or mouthpiece. I've used this for 8 months and didn't even realize it had a shutoff at the mouthpiece because it's never leaked, even in the open position.