Be smart and forget about your big food storage containers, plastic wraps, casseroles. Once the adjustable lids are on, the bowls are also stackable. You can use them on any kind of small or large bowls, mugs, soda cans to keep your coffee hot/cold great for camping or picnic also. SHOP NOW - https://www.amazon.com/12-Pack-Reusable-Expandable-Airtight-Silicone/dp/B07DY5MB8B