In the "Tips & Tricks" video that MistressNomad made, she used orthodontic elastics on her carts, etc. I couldn't find those, so I looked at Wal-Mart, in hair accessories and found little elastic bands-3 sizes in one pack-in different colors. I put the smallest on my cart, and the middle size or biggest on the flavor bottle. Great idea MistressNomad for identifying what's what!