Thomas Gruenberg wrote a review of CamelBak Delaney Plus Hydration Lumbar Pack - 100cu in on January 8, 2013
Familiarity: I've used it once or twice and have initial impressions
I have used the pack once so far. I love the fit and the ride during my run. It was barely noticeable, and had no issues with the bottle rubbing. My only complaint was the gel flask fell out about a half-mile into my run. I was able to recover it. I am going to try carrying the flask again in the mesh pouch, but if it falls out again I will just carry it in one of the zipper pouches.