It’s a bottle cover. "Honestly the image is deceiving. I thought it would have some type of seal around the neck but they just pushed the nozzle through the bottom and use it as the top, which I don’t suggest that you leave the entire bottom of your squeeze bottle to be exposed to everything on your tray. I wrap the neck with an elastic. if you have a bottle bigger than 250ml it won’t fit height wise." — Johnny c. (2/5)
Great Quality "Nice and thick and fits over the big bottles perfectly and it takes a long time before you run out" — Emily H. (5/5)
Necessary "Help you keep everything clean and is a good barrel for cross contamination" — Mglock (5/5)