Well, I’m no chemist and do not know the difference between kydex and a plastic trash cans composition, but I’ve never seen a plastic garbage can shatter from being too cold or melt from being in the sun. I do know that kydex at $10 a pop for a holster size sheet is to expensive just for me to experiment with. Once I get the hang making a few holsters I may try my luck with real kydex plastic, but this water cooler plastic is holding up pretty good so far. I’ve been wearing it around the house since I made it.