No worries, and I could have been a bit clearer in my earlier posts.

If you store anything in a hot car that can be affected at all by heat, you must insulate. But that is not all that must be done to ensure that the supplies remain viable.

JI....remove and replace the FAK in the car daily....as a fellow FL it is really the ONLY way. It gets annoying but unless you do what EMS does and AC the interior with a shoreline to keep the contents cool.......removing is the only real way.

I found some old FAK stuff in the garage that included sterile surgeons gloves....you know the old latex ones.... needles to say they were melted to the paper (I KNEW they would be, I just wanted to see it).

I have seen dash boards melt, but that was overseas.

If JI needs to stash a vehicle with kits inside, she will need to choose the parking area to ensure that it does not get direct sunlight for too much of the day. A parking area in the shade, with good packaging of the kits should prolong the life for months rather than days. Multiple layers of insulation may help, with the fluctuations of temperature over a 24 hour period. Understanding material and packaging is important for this.

This thread makes me believe that there may be a need for some education on the factors affecting long term storage. What breaks down materials and substances, durability of different materials in different environments, methods of mitigating the breakdown. Is this something that would be useful? If so, I suggest a new thread with a broader purpose than this one.

Excellent notion. Suggest a focus on long term storage of water; food, canned and otherwise; medications and chemicals - all with respect to appropriate containers, temperature ranges, and exposure to sunlight. Type of hazard would be a factor too. You probably stash differently if your concern relates to earthquakes vs. hurricanes, for instance.

Also a different thread title. I first thought this current thread would indicate why the owner of a Mustang or GTO would need a better FAK....

That would be a useful topic. Some items like medications and other chemicals may have storage temp requirements that preclude storage in a car, while other first aid items are impervious and are good with long term hot or cold. Knowing which items to be concerned about may allow for a smaller kit that needs more careful storage.