A 5x10 storage unit is the size of a small walk-in closet.
It fits furnishings of a mid-sized bedroom, including a queen-sized bed, a dresser, a TV and several small to medium-sized boxes. The unit is 50 square feet in size.

A 10x10 storage unit is the size of half of a standard one-car garage.
It fits the contents of an entire family room or two full bedrooms, including several small to medium-sized boxes. The unit is 100 square feet in size. Not the best for appliances.

A 10x15 storage unit is a little smaller than a standard one-car garage.
It fits 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. The unit is 150 square feet in size.

A 10x20 storage unit is the size of a standard one-car garage.
It fits the contents of a multi-bedroom house, including several oversized items such as a couch, a refrigerator, a washer/dryer and a dining room set or several large boxes. This unit is 200 square feet in size.

A 10x25 storage unit is a little larger than a one-car garage.
It fits the contents of a fully furnished 3 bedroom house, including oversized items such as a couch, mattress sets, a dresser, a refrigerator, a washer/dryer, a dining room set, an entertainment center and several large boxes. The unit size is 250 square feet in size.

A 10x30 storage unit is as large as a 1 ½ car garage.
It fits the contents of a fully furnished 3-5 bedroom house, including oversized items such as a couches, beds, dressers, a refrigerator, a washer/dryer, a dining room set, an entertainment center and several large boxes. The unit is 300 square feet in size.