I have been looking up various running pouches and have determined that I will definitely need to use some kind of plastic bag like the Loksak to supplement the non-water resistant or minimally resistant pouches. Now my run sessions are hardly long. I am only getting started on 5K and adding walking sessions with it, so maybe a grand total of 1-1.5 hours on my feet. However, I work up a pretty heavy sweat even on cool days, hence the waterproof bag. Should I worry about any overheating issues when I use such a sealed bag?