This was the first time I'd bought a hydration bladder. As such, I had to choose between the Ospery, the CamelBak, and this one. Price swung it for me, and I went with this one.
Unfortunately, I'll be returning it tomorrow.
The plastic feels sturdy and strong, and the drinking tube connection is good - but the bag leaks at the seal.
It's closure mechanism is via folding the plastic over and sliding a gripper on top. However, this doesn't seal it very well. When half-full and sealed, holding the back horizontally caused water to drop out of the closure.
Worse, I filled the bag up to its 3L mark and closed it. I then slid it into the bladder pocket in my rucksack, and the seal popped right off, opening the bag wide and sending water spilling all over the inside of my bag.