Musto 40L dry bag: 

waterproof bag for sailing/water sports

waterproof seam sealed technology.

Never used.  Just been sitting around hoping to get wet, but it never did!

The dinghy (GP14) had to go too, but that is another story. 

Photos don't do justice; See this image for a better idea. https://www.wetsuitcentre.co.uk/musto-waterproof-40l-dry-backpack-black.html

Free postage Royal Mail