Store test strips between +2 and +30 C, says on the tin.
Tin has good seal, but I would still worry about keeping it in a Frio
Don't know about my meter's heat tolerance. I keep it out of the midday sun in a zip bag inside another bag.
I only need to use Frio about once a year, but when I do I do. I can't get over Frio! Simple, clever, and it works so well for days to safeguard the insulin.