Rating: 1 / 5
I purchased the 2L version of the reservoir, and the optional drinking tube. When I filled the reservoir and inverted it, it immediately leaked at the location where the diamond shaped plastic insert joins the neck of the bottle. This was a substantial leak which would drain the bottle in a few minutes. Evidently the plug was not sealed into the bag properly. I emailed Platypus about the problem.
I have a few of the 'Platy Bottles' which do not leak when inverted, but this is a review of the Reservoir, and therefore this product gets a '1' because it is unsuable for its intended purpose.
Edit. I returned the 2L reservoir, and purchased an identical replacement. When I inverted it, the bottle with the OEM cap did not leak. However, it leaked when I connected the OEM hydration tube to the mouth of the reservoir. I seated the cap carefully and tightly, but not too tight so as to distort the plastic threads. Inverted it in my pack and left it for a few hours. When I returned the bladder had leaked about 100ml. Not acceptable in my opinion.
I use Platypus bladders only in the upright position now, and carry a Nalgene soft canteen for my second bottle.
I am continuing my search for a light weight hydration tube system.