this is one of them I read about as an alternative to pyrex cups. They are silicone so they insulate better than pyrex to keep your plastic hot longer BUT they are not as ridged. But for small runs it should be fine. I make 1 inch thick insulators out of pop for my cups to keep the warmth in longer and less reheats. I will mainly use it for dipping but I will let yall know how they do when I get them. here is a link to them

SILICONE MEASURE STIR POUR CUPS 1, 2 OR 4 CUP MEASURING | eBay