Storage in San Diego Size Estimates In an effort to assist you with selecting the proper size for your storage rental unit, we are pleased to provide the following contents chart. Note that the chart should only be used as a guide as it’s based on average sizes for the listed contents. Unit Size Cubic ft Square ft Possible Combined Contents 5’ x 5’ 200 25 Chest of drawers, several boxes, and small items 5’ x 8’ 320 40 Furniture from an average-sized bedroom plus several boxes 5’ x 10’ 400 50 Couch, chair, misc. items, mattress set, chest boxes 10’ x 10’ 800 100 One-bedroom apartment with boxes and small items 10’ x 15’ 1200 150 Two-bedroom apartment with appliances, boxes, small items, compact car 10’ x 20’ 1600 200 Two-bedroom house with appliances, misc. items and boxes