I missed this thread earlier, but what a great idea!
William Bronson wrote:but right now I'm thinking of double end closed head wrenches for the handles.
The could be part of the set that is being carried, or extras.
Umbrellas as source of cloth is a great idea, I was thinking of canvas or the cloth they make hammocks out of.
Using wrenches (spanners) is inspirational. It's easy enough to pick up some double ended ones from a garage sale for pennies, they don't have to be top quality by any means. One advantage of umbrella fabric (who hasn't got a broken umbrella?) is that it is very fine so will fit through very small holes as well as being light weight and thus compact.
I wonder if we should even call them "handles".
Most pictures show the furoshiki being held by the knotted cloth, indeed the wood "handles" often have magnets in them, so they stick to each other.
They are more like a clasps than handles.
Agree, they are struts or braces that stop what you are carrying from being compressed by it's own weight, like an engine lift bar. Neat! Ideal for picnics too!