How would one put 70 cubic feet into perspective?

Answer 1

-- the space inside a cube (box) that's 4ft 1.5inch on every side

-- the space inside a spherical balloon that's 5ft 1.4inch in diameter (across)

Answer 2

70 cubic feet is roughly equivalent to the space inside a large refrigerator or a standard bathtub filled up to about two-thirds of its capacity. It could also be visualized as filling up a stack of seven 10-cubic-foot boxes.