A 5x10 self storage unit is a 5 feet wide and 10 feet long, totaling 50 square feet. For comparison, a 5x10 space is a small storage unit that's about the size of an average walk-in closet. Unit has a 9 1/2 foot ceiling, giving you up to 475 cubic feet of storage space.

A 10x10 self storage unit is a 10 feet wide and 10 feet long, totaling 100 square feet. For comparison, a 10x10 space is a 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. Unit has a 9 1/2 foot ceiling, giving you up to 950 cubic feet of storage space.

A 10x15 self storage unit is a 10 feet wide and 15 feet long totaling 150 square feet. 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. Unit has a 9 1/2 foot ceiling, giving you up to 1425 cubic feet of storage space.

A 10x20 self storage unit is a 10 feet wide and 20 feet long totaling 200 square feet. A 10x20 storage unit is great for storing contents of a multi-bedroom home, about up to five rooms of space. Larger items like living room furniture, patio furniture, full-sized appliances and more fit inside these units. A 10x20 storage unit also works well for storing large quantities of boxes or outdoor equipment. Unit has a 9 1/2 foot ceiling, giving you up to 1900 cubic feet of storage space.