A Creative Grandpa

A grandfather would go out of town and he had to board a plane. But in entrance plane, grandpa are not allowed in because he is carrying a long steel rod $\sqrt 3 \text{ m}$ . regulations in the plane that passengers may only carry goods of less than one meter. Unless put into a garage.

He had an idea that he would put it into a cube. what volume of the cube (in $\text{ m}^3$ )? Assume it's the bendable or foldable.