GREAT VALUE: Half of the money to buy 4 pack of 11 inches x 25 feet rolls, total 100 feet. No pre-cut design, creating your own length of bag. Less food wasted, much money saved. BETTER DEAL!!! HEAVY DUTY & STABLE: Two layers 4 mil heavy-duty bags with embossed air-removal channel which are stable for heat and cold, boilable, freezable, microwave and dishwasher machines. Perfect for Sous Vide cooking. Blocking oxygen and moisture and eliminating freezer burn and dehydration to keep your food fresher, juicy and flavorful. SAFETY MATERIAL: B