UltraSource Vacuum Chamber Pouches, 3 mil, 4" x 6" (Pack of 4500) NOT COMPATIBLE WITH FOOD SAVER SEALERS Use with a chamber vacuum sealer (not FoodSaver compatible) to safely package and store meats, cheeses, vegetables, and grains Chamber sealing locks in freshness, flavor and nutritional value while extending food storage time Durable 3 mil thickness keeps your product safe during storage and transportation BPA free and FDA approved