If you worry about the rest of the food will be wasted, you will have to worry about the metal will rust. Might as well try putting them in a vacuum. Stay fresh. One side is smooth, with fine grain. Advanced food grade packaging bag, can be high temperature steam, can be placed in the microwave oven heating, suitable for food vacuum packaging, can also be used for other products packaging. Features:1. Free cutting, easy to use.2. Resistance to freezing, can withstand the temperature change and hot.3. Fresh keeping time, keep the smell, safety.4. Green environmental protection, you can cut off the mouth of the sealed bag, clean and reuse.5. Can be used for vacuum packaging, aseptic packaging.6. One side of Grain bag is a pressure lines, the other side of the smooth professional vacuum bag, suitable for all vacuum chamber at home and abroad, the principle of automatic vacuum vacuum packaging machine. Specifications:Material: PAColor: As Picture shownSize: Approx. 28*500CM/11.02*196.85inchPackage List:1 * Roll Food Storage Bags