When and if humans return to the Moon for a lengthy stay, a base camp would be extremely useful. In a spacecraft like the one below they could eat, sleep, bathe and work. They are made by the American company Bigelow Aerospace.

Bigelow Aerospace

BIGELOW MODULES ARE...Before launch, these expandable craft are placed atop a rocket, inside a narrow reinforced container, called a fairing.   Once the spacecraft take off and reach orbit, they expand to double  their original diameter, and the fairing is discarded.

BUT NOT RETURNABLE
Astronauts going to the Moon would leave and return to Earth in a separate spacecraft, not in the Bigelow modules. The Bigelows are instead designed to someday house people during their stays in space.

TEST CASE 
These spacecraft have not carried humans in  space, but Bigelow Aerospace has successfully launched two craft into Earth orbit, where they remain today.

Bigelow Aerospace/Photo Researchers