Reinhart and others recommend half-sheet pans for proofing bagels, etc.  But you are supposed to place the half-sheet pan into a food grade plastic bag during the proofing and retarding cycles.  Twenty years ago my late mother in law purchased a large quantity of such bags from the KA catalog and gave me 100 or so but even with careful washing and recycling I am about out.  Anybody know where I can buy more?

Thanks and Happy Baking.