Cat-proof wool

An innovative idea from the early 1950s by Torpedo Wools - plastic-wrapped balls of yarn. "Protected when you buy them, protected when you carry them, protected when you knit them" - judging from the illustrations, the idea was to pull your yarn out through a little hole in the bag, and knit with your ball of wool still wrapped in the cellophane.

Note the frustrated tabby kitten, desperately trying to paw the goodies within but thwarted by the mighty power of cellophane. Tough luck, tabby kitten, and better luck next time.