Yup. the best part about using the PET from left over PET containers is that it’s already food safe. you could, if you really wanted to, buy some sheets of amazon, but why bother.
also, for the large cup things… there are other things where this trick is useful… like… making pudding cups… :P Most berry containers will have enough of a flat spot you can cut out for a decent sized cup. (especially if you shop at costco or whatever wholesale club, lol.)
saw that little tyke the other day chilling in our grass.