While repacking my mini-PSK (again...) I discovered that the plastic worm fishing lure, which was next to my Acme Tornado whistle, had reacted with the whistle's plastic body and was kind of melting it. Very strange. Needless to say, the Crème Lure worm got its very own plastic wrap to keep it away from everything else. All of which goes to show that just because you have a PSK, you shouldn't assume that everything in it is going to be OK six months or a year from now.