There are inexpensive and flexible coolers that will moderate the temperatures a lot. It just depends on the size of your kit.
For a short-term, that may work. Not when the kit is stored in the car all year long.
Jeanette Isabelle
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I'm not sure whose twisted idea it was to put hundreds of adolescents in underfunded schools run by people whose dreams were crushed years ago, but I admire the sadism. -- Wednesday Adams, Wednesday