Some Helpful Tips on the size unit to rent:

General Size Typical Use
   
5 X 5 File, Boxes, Clothing
5 X 10 1 1/2 Rooms of Furniture
5 X 15 2 Rooms of Furniture
10 X 10 3 Rooms of Furniture
10 X 15 4-5 Rooms of Furniture
10 X 20 6 Rooms of Furniture
10 X 25 7-8 Rooms of Furniture
10 X 30 9 Rooms or Commercial Use