Yes @leeosteo this is it! I bought a power bank in case there isn’t any electric outlet👇. This is tsa approved.
https://a.co/d/8CVlRCg
It takes about 20 min to cool down the cynlinder carrier from 72F to 46F, which is required temp for FORTEO storage. Another 25min from 46F to 37F, which is lower end of storage temp for FORTEO. After that, the inner temperature of this cylinder carrier just bounces between 37F- 45F!

I’m testing the length of time this power bank (fully charged) can be used for cooling. So far it’s been 8 hours of cooling, with 53% batteries life remaining. Once it’s drained, charging doesn’t take long.