My understanding is the dye might be an issue..... that said I just read a review that claimed the sandwich size bags had chemicals leaching issues... except Ziploc brand. Of course I assumed they all would be safe and have a ton of store brands.I was curious to know if these industrial totes are food safe. This is what I found out. The totes I purchased are stamped with Plastic Recycle code #5 PP (Polypropylene).