Go to a butcher and get it in paper. Make your own mayo...it's an egg, veg oil, and a little salt and pepper...store in glass. Salad dressing...store in glass. Metal tops. Pretty much the packaging up until the 70's.

+1. The prices of meat at the butcher section is usually the same as the one in the pre-packaged meat section.

As for mayo, maybe just eat less of it as it isn't exactly healthy. Or get the ones in glass bottles. Same goes with salad dressing.