This is the crate I created for the Challenge graphic and to kick off the challenge.  Its a modular design, created from stamped recycled plastics.   The handle on the center of each panel, pops out, disengaging the locks, and you rotate to the right to unlock and remove that panel.   Simple, sturdy, and easy to make diffrent sizes of crates very quickly with no tools required.   Plastic also adds a measure of shock absorbtion, to help protect the cargo and it floats :).