Personal Storage Box

The Personal Storage Box is (as the name implies) a container for strictly personal storage. It cannot connect to machines or belts in any way. It has 25 storage slots for items (one more than the Storage Container) and uses 8m³ of space, which occupies only 4% volume of the Storage Container, making it considerably more space efficient than the Storage Container.

Trivia

 * The Personal Storage Box can be stacked 2m apart from each other. Construct some stacked 8x2m foundations, build the upper storage box then deconstruct the upper foundation. Build the lowest storage last.