These generic heavy-duty bags can be microwaved, boiled and frozen. They are dishwasher-safe and can be reused and resealed. Save money on these bags. Pay 37 cents a bag versus genuine Tilia bags at 73 cents a bags. Made of 2-ply, 3-mil nylon with a layer of polyethylene mesh.. Features Can be used in most leading brand vacuum sealers.; 2 ply, 3.0 mil thick; BPA Free; Heavy-duty bags with air-removal channels for maximum freshness; Use to marinate foods in minutes; Made from FDA listed food safe materials; Great for food and non-food uses like preserving collectibles, valuable documents, silver or electronic items; Simmer or microwave food right in the bag; Bags Measure – 11 x 16 in.; Count – 100; .