Don't know what size you have in mind...but.... I use an old gallon plastic milk jug, cut the top off above the handle, right wher in narrows in, cut if flat and level. fill 3/4 with water set it in the freezer. Turn it upside down and give it a whack or 2, slide right out. 4 of them fit right nice, across the bottom of my Igloo.
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