I don't see myself using it very much. I don't really ever use my standard size Provari with the 18650 extension on it. It would nice to have the option to go there though. The reason I got my second Provari in a Mini size is so I could have the smallest configuration. I like it small. There would be a time I can see using a larger battery though so the sleeve would be a welcome addition.
So for someone that got a Mini for their first Provari, the sleeve would be a welcome addition for those times that carrying around extra batteries might prove weird.
So for someone that got a Mini for their first Provari, the sleeve would be a welcome addition for those times that carrying around extra batteries might prove weird.