You can find a safe in nearly any size you need. If you're just using it for storing papers, jewelry, or a handgun, you could buy a small safe that fits on a shelf or in a drawer. For large items, you can buy a safe as big as 6.5 ft. tall or more that takes up more space. A big safe could not be carried away by burglars or easily moved by anyone else in the home. The best thing to do is take an inventory of everything you want to protect and purchase a safe big enough to hold all of those things with a little extra room left over.