These bags have the embossed dotted design with air extraction channels, it blocks both oxygen and moisture to keep the sealed food fresher up to 3-5 times longer than ordinary storage methods, lock freshness, keep nutrient and retain flavor These thick vacuum bags can be used to sealed food for longer storage and also suitable for microwaving, freezing and boiling, after washing they can be re-used, absolutely economical and better value Perfect for all types of vacuum sealers, compatible with Crownline vacuum sealer machine and theses are BPA-free, FDA-approved, non-toxic and complies with food safety requirement With high density micro-channels make the bags super flexible to provide a super-tight fit that serves as food armor This particular pack contains 20 pieces 15 x 25 cm bags this sized bags are perfect for vacuum sealing and longer term food storage as well as sous vide cooking