Hi Chuck, it has ben a few years since I have made a concerted effort to find a holster/bottle carry. Will need to check out some local sports stores. The last time I did that, all I could find were bottles larger than 8oz. I never considered carrying one on my back; I always attached it to my belt. Hence the issue of not more than 8oz, if I wanted to keep my pants on. Most of the holsters, were collapsable, I was looking for one that stayed open so it is easy to get the bottle back in when hands are full.

Thanks Chuck,

Pieter