What is it with cats and bags? One of mine, Ebony, is obsessed, she loves to sit on them or in them, and I think she likes the noise pouncing on a carrier bag makes!
And the other one likes to run and skid on the dining room floor.
And both really like the satin texture of the throw on my bed.
They are my first cats so I'm really enjoying seeing all the strange and silly things they do!