Topic: Foldable SUP Sail
This is something interesting, a vertical batten sail that let you rig in about 60".
Probably (in this incarnation) only good for very light winds, but with some changes ...
As somebody commented on an English forum if somebody can come up with a way to easily do this in the water a lot of light wind sailing venues would open up: paddle out, unfold the sail, have fun (or go out in marginal conditions, winds dies, paddle in).