Rating: 4 / 5
The dummies didn't make the cap the same size as it is on their wide mouthed jars (a defacto standard) so certain screw on filter adapters don't fit. Otherwise, a nice product. I like the snap on drinking tube that lets me leave the tube in the pack while I refill the bladder, and absence of any taste imparted to the water. I bought an extra fitting so I can snap on my filter output tube for refilling.
The fill opening is actually so big I can get my hand inside with a paper towel to dry it out. (Ok, maybe they're not dummies).
This bladder got some bad reviews because the coupling at the bag would leak. I checked with Nalgene before I bought. They said they fixed the problem by changing the o-ring. I haven't had any leaks. This bladder comes with a magnetic clasp that goes on the pack strap. It holds the mouthpiece and keeps it from flopping around. I thought it silly at first, but it proved to be a nice little convenience that minimizes fumbling both when retrieving the mouthpiece for a drink and when replacing it. Water will freeze in the exposed portion of the tube. Somebody advised blowing to clear the tube when it's below freezing. That works.