Here's an easy way to reuse plastic bubble wrap to help save energy at home: Use it in your freezer. Since bubble wrap has pockets of air that help insulate, wrapping items that need to stay frozen helps them stay ice-cold easier, especially if you open the freezer door regularly. Consider wrapping containers of ice cream and frozen meats in bubble wrap, and even laying sheets of it on the freezer shelves. Every time you open the freezer door, the bubble wrap helps keep the food frozen longer, so your freezer doesn't have to work as hard to keep temperatures low. You can also use it in the refrigerator to line shelves that hold beverages to help them keep their chill.