Preservatives and antioxidants may be put into some food and drug products to make their shelf life longer. Some companies use induction sealing and vacuum pouches to add to the shelf life of their products. Some things can be controlled by provisions in the packaging. For example, the amber bottle used for many beers blocks damaging wavelengths of light. Transparent beer bottles do not. Packaging with barrier materials (e.g., (low moisture vapor transmission rate, etc.) extends the shelf life of some foods and pharmaceuticals.