It neatly stacks bottles or sippy cups up to 12 of them! Take one out and then other drops down. It's genius! I love that it fits perfectly into our kitchen cabinet. I don't have much space and this really solves that issue! It's also adjustable so once we get bigger cups for her I can just extend the organizer and no muss no fuss! If it ever happens to get dirty, which I'm not sure how - it's also dishwasher safe and can be used in the refrigerator or freezer!