5x10 with concrete floor and 37 inch outswing door. Equivalent to a walk in closet. You can fit a bookshelf, a dresser, a TV and several boxes.

10x10 with concrete floor and barrel door. Equivalent to storing a one bedroom apartment, which can include a bedroom set and some small boxes.

10x15 Unit with concrete floor and barrel door. Can hold the contents of a two to three-bedroom apartment or a small house, including furniture, appliances, and boxes.

10x20 unit with concrete floor and barrel door. This unit can typically hold the contents of a 3-4 bedroom house, including furniture, appliances, and boxes. It's also large enough to store a car, small truck or motorcycle.