Vacuum packaging bags are available in many different sizes to fit different sizes of food vacuum sealers. What they all have in common is the ability to be sealed at a very high temperature without melting. Food vacuum machines must always be used with specialised vacuum packaging bags. Vacuum packaging bags, as mentioned earlier, come in an assortment of sizes. There is a huge range in sizes and bag type, some bags and pouches are stand up style with zip locks or nozzles, some have silver backing and some have a black back and clear front. Plastogold bags are another option to use when sealing and storing food - one side is reflective gold and the other is clear for viewing the produce. The bags are designed to fit onto the vacuum packaging machine and once the food is placed inside the bag, the air is withdrawn and the bag sealed, keeping the contents fresh and easy to store. Commercial kitches often use food packaging machines and home kitchens can also benefit from the reduced amount of food wastage and longer shelf life of produce.