Unbranded Silicone Cylinder Ice Cube Tray for 40 oz Tumblers, 3 Cavity Ice Mold w/ Lid

I have used this and it will work for a 30oz if you use all 3 but its super tight works best for 40oz. If you want to use all of them. Fill the Cavity with warm water for 30 seconds to help it loosen. Light greenish is truer color. No tears or defects in the silicone. Smoke Free Pet Friendly Home