Compression (Extra Utilities)

''Do you have chests upon chests of cobblestone lying around that you wish you could store in a couple of items - well now you can. Place 9 cobblestone in a crafting table to make compressed cobblestone. Then place 9 compressed cobblestone into a grid to make double compressed cobblestone. This can be repeated up to quadrupal compressed cobblestone.''

To uncompress your cobble, simply place the compressed block in the crafting grid. You can use any of the colored varieties of cobblestone as well, but when it is uncompressed, you will only get normal cobblestone back. Dirt can be quadruple compressed, and sand and gravel can be double compressed.