Always Fresh containers - food lasts up to 50 days longer than ordinaryplastic storage containers while preventing freezer burn. Save moneyfood stays fresher longer, so you throw away less. Made withnanotechnology, containers include silver nanoparticles naturallyantibacterial and help prevent the growth of mold and fungus. Great forfruits, vegetables, herbs, bread, bagels, salads, cheeses, soups,sauces, meats and more. Keeps bread soft and cookies and crackers crispand is microwave and dishwasher safe. Five piece set plus lids. Plastic.