Put the words "flat" and "pack" together, and TreeHugger usually needs a towel to contain the drooling; there are few things we like more than the ability to change dimensions, create structure from wafer-thin materials and make efficient use of materials in manufacturing and space when shipping. With that in mind, we submit for your consideration: the Zweifach Shelf.
Designed by Simon Schappi and oddly reminiscent of Kindergarten, each double cubbie starts as three separate, flat pieces; spend a few minutes folding and fitting, and a modular shelf is born. This is one of our favorite things about this design: you can build only as much storage as you need; the modular, stackable system lets you expand and contract your storage as the volume of your stuff fluctuates. Empty a box or two out? No need to waste space with empty storage; just break down one of the boxes. Perfect for a small apartment dweller, frequent mover or anyone who doesn't want to kill extra space with storage you don't need. ::The Formsons via ::swissmiss