Shelves
Materials needed:
6 bookshelves
6 wooden slabs
4 chests
First put 3 bookshelves above each other then place another 3 bookshelves above each other (2 blocks apart), next put 2 chests next to each other (in between the bookshelves). Now place 2 upside-down wooden slabs above the chests and place another 2 chests on top of the slabs, finally place 4 slabs on top of the chests and the bookshelves and you are DONE!!