The following chart provides a rough idea of the size until you will need to rent.
5x5 Hall Closet
Small furniture, chest, boxes, small items, holiday decorations, business records, files.
5x10 Walk-in Closet
Couch and chair, chest, boxes, mattress set, business record, overflow inventory
5x15 Large Walk-in Closet
One bedroom size apartment furnishings (without appliances, motorcycle)
10x10 Average size bedroom, ½ of a garage
2-3 rooms of furniture, appliances, boxes, motorcycle, lawn tools, office furniture, files, excess business inventory
10x15 Large Bedroom
3-4 rooms of furniture with appliances, business inventory
10x20 Small One Car Garage
Furnishings from a small house or 2 bedroom home with apartment with appliances or a car or truck
10x30 Oversized One Car Garage
Furnishing from a 3 bedroom home with appliances, or contents of a large moving van, or a car and 1-2 rooms of furniture