I used to take (as I was camping before frilo pouches) an airtight container and spare bowl with me, then insulin in airtight container, fill the bowl with cold water then put into the shade, when I moved upto a trailer tent it was kept under the bedding area, as it's pretty cool under there..
Never had a problem with any insulin going off even on 3 weeks stays when I only had the cool box, and no ability to refreeze the ice packs for it..
Don't forget both will last a month at normal temps, as long as they are not in direct sunlight