Mesh Bag as Tension Network
Read here about tensegrity and structures that consist of bags containing bars. This is a special case of a membrane tensegrity structure.
In such structures, the bag supplies the tension that holds the compression struts in place. Unlike conventional tensegrity structures, the tension element is not fashioned securely to the strut.
The mesh bag in de jong's photo has six struts.
This image, published on the web, shows seven struts in a similar net bag.
Links and References
Membrane structures, see membrane. De Jong's blog of the event: Gerald de Jong blog entry on visiting Kenneth Snelson