Before you make your purchase, know exactly what you plan to put in it. Some safes have soft fabric lining to protect fragile items from scratching. Others come with shelves to help organize interior spaces. Before you buy, stack up all the stuff you intend to store in the safe. The volume inside most home safes is about 1.2 cubic feet, which is about the size of a 12-inch-tall stack of paper. If you want to add valuables like jewelry, you may need a larger safe.