Jigsaw mat. Portapuzzle Carrier or similar (Stroud GL5)

I'd like to do the 1000 piece jigsaw a neighbour kindly passed on to me but I don't have the space to leave it out all the time. I've seen people using semi rigid mats with a cover so they can simply pick up the unfinished puzzle and lean it up against the wall. I wonder if you have one that you don't want and would be prepared to pass it on to me? I would be enormously grateful if you do...