A 5' x 10' storage unit is the size of a small walk-in closet.

This unit can fit the furnishings of a mid-sized bedroom, including a queen-sized bed, dresser, a TV and several small to medium-sized boxes.

A 10' x 10' storage unit is the size of half of a standard one-car garage.

This unit can fit the contents of an entire family room or two full bedrooms, including several small to medium-sized boxes.

A 10' x 12' is about the size of a small bedroom.

This unit can fit the contents of a typical two bedroom apartment. 

A 10' x 15' storage unit is a little smaller than a standard one-car garage.

This unit can fit the contents of three full bedrooms and larger items such as a piano, couches, tables or large-screen TVs, plus several medium to large sized boxes.

A 10' x 20' storage unit is the size of a standard one-car garage.

This unit fits the contents of a multi-bedroom house, including several over sized items like a couch, a refrigerator, a washer/dryer and a dining set or several large boxes.