This bladder is the first one with a quick connect I've used that didn't leak. It's silly to have to put all your stuff in ziplocs inside your bag because you can't trust the bladder, but that's exactly what we all end up doing. Thanks, Camelbak. This Deuter/Source streamer bladder is slick. The helix/bite valve is rock-solid, and ensures that all your stuff stays dry when you throw the bag in the back of the car at the end of the day. It's not that water will drip out if the helix valve is open, it wont, but it acts as a backup to inadvertent pressure on the bite valve. The fold-over top design is also nice, and a welcome change from the 'i hope it's tight enough' screw caps other bladders use. I dinged it a star because I wish the slider would lock on a little more securely. I haven't had it ome loose or anything, but for peace of mind, I'd like more security.