A 10' x 20' unit is 10 feet wide and 20 feet long, totaling 200 square feet of space. It has an 8 foot ceiling, so you can pack to a space of 200 square feet plus 8 feet high, or 1,600 cubic feet.

A 10' x 15' personal unit is 10 feet wide and 15 feet long, totaling 150 square feet of space. It has an 8 foot ceiling, so you can pack to a space of 150 square feet plus 8 feet high, or 1,200 cubic feet.

A 10' x 10' personal unit is 10 feet wide and 10 feet long, totaling 100 square feet of space. It has an 8 foot ceiling, so you can pack to a space of 100 square feet plus 8 feet high, or 800 cubic feet.

A 5' x 15' personal unit is 5 feet wide and 15 feet long, totaling 75 square feet of space. It has an 8 foot ceiling, so you can pack to a space of 75 square feet plus 8 feet high, or 600 cubic feet.

A 5' x 10' personal unit is 5 feet wide and 10 feet long, totaling 50 square feet of space. It has an 8 foot ceiling, so you can pack to a space of 50 square feet plus 8 feet high, or 400 cubic feet.