One common example of an object that is approximately 300 cubic feet is a small shipping container, often used for storage or transport purposes. These shipping containers typically measure about 10 feet wide, 8 feet tall, and 30 feet long, which gives them a total volume of around 2400 cubic feet. However, if we scale down, a more manageable example would be a large refrigerator or freezer, which can range from 20 to 30 cubic feet in volume.
An average cubic space that many can relate to is the volume of a small bedroom or a bathroom. A room that is about 10 feet long, 10 feet wide, and 10 feet high would yield approximately 1000 cubic feet, so a room that is around 3 feet tall, 10 feet long, and 10 feet wide would be roughly 300 cubic feet.
Another example is a fish tank. A large fish tank can often be around this size, providing ample space for various marine life while also being manageable for most hobbyists.