I, too, have made many, many bowls and potato bags. Must use 100% cotton as everyone has said. Make sure batting does not have poly scrim in it. My info on the bowl says to make sure it has been laundered frequently as spills can cause burning. My son had some soda on his counter, and apparently set the bowl on it and when he used it next time, he had a burn (no fire) from the sugar in the pop. Potato bags: let them dry 100% after EACH use and wash them frequently as the starch in the potatoes accumulates and can cause a problem.