Straps. Do you need straps? Only got one board, my 6ft 8" JP Foil board that has the inserts. Would like to try my other boards as well. But they haven't got the inserts.
And just thought of an idea for down wind foiling. How would it go to send you up wind. Then stop somewhere preferably on shore to pack it up in a backpack. And then downwind foil back. No need to get a lift back to your car.

Where I surf I have paddled up wind for about 2kms before the downwind strengthens. Then downwind it back.
If the Slingwing is easily foldable then I would be able to travel at least 10 kms upwind.
It looks like you can tie your paddle to it as well. So just wondering if this is so? Would come in handy.