Gravità.
Collapsible Rack.
The small timber bar locks the whole system and prevents it from collapsing while carrying it around. The main force is led through the metal rack into the ground. A small hook on the bottom ensures that the rack stays in place.
The bench can be disassembled easily and stands through gravity and friction. The same system can is applied to the associated table as well. This also leads to a full product family.