Years ago when I was flying sailplanes I used bubble wrap and foam around my receivers. Some hobby company was marketing packages of the combination for that purpose. One day I caught a beautiful thermal and soared to a very high altitude. Later I found that all the bubbles had popped! I don't know exactly what altitude would be the limit for this material and the stuff survived other flights that did not get so high.

It's probably not a problem for most sport flying but something to keep in mind if you fly anything that can ride a thermal.