I'm trying find a solution to my dilemma that I have to leave my thermo racquet bag in the car trunk in the morning, so that I can go to the tennis club to play right after I leave work in the evening. And ..... I found this. http://www.amazon.com/Emergency-Thermal-Blankets-4-Pack/dp/B0007N0XDO The racquets will be in the car trunk for about 10 hours. Say if I take each blankets and wrap it around each racquet and seal it with rubber band. Will that help?