Hot cars are a definite no for these things I've determined. If unavoidable, then storing them upside down makes sense for a bottom coil. I'm bracing myself for summer. Also pulled the trigger on an Erlkonigin. It's an RTA similar to a Kayfun, but with a special juice feeding system that is supposed to somewhat alleviate issues with large shifts in pressure and temperature. Hopefully it works!
I have a tote similar to that one that I carry daily to work with an ice pack and holders for my extra tanks. The holders are old pill bottles inside a Spam can.
I'm finding that it is not up to keeping cold now that it is over 100 and must find something better.
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Ever hear the one about someone heating up a battery to see what happens ?
In the last two weeks here in the UK we have had lovely, sunny hot weather. One of my friends who vapes left her Innokin vw set up in her car for 3 days. It stopped working.
Another of my friends left his smartphone in his car for 3 HOURS. Came back to use it and the battery had ruined the phone. When he took the battery out it had swollen up to 1" thick. Luckily the battery was in some sort of LiPo bag coating so didn't explode.
By all means store kayfuns and the like upside down when not in use but don't leave batteries in cars. Please.
its not so much the pressure changes that cause leaking as much as its the viscosity between the juice in the wicks and the juice in the tank equalising. if you top off your tank when they equalise the wicks will suck up the juice like a straw and flood the coil chamber.
some juice will do this in a new set up. some will do this after the juice in the wicks has thickened over time. some will never do this.
i use top coil tanks only so my recommendation will not work for bottom coil systems. if you start experiencing flooding issues fill the tank to the second fill marker below full. this has eliminated 100 % of my flooding issues and, 90 % of any gurgling problems. you can adjust from there. i personally do this all the time as i'm to lazy to track which juice is more inclined to do this as opposed to another. i hope this helps.