I use long door mat runners like these to cover hutch doors at night: [...] Put hooks along the top of the hutch and make corresponding holes (use a hot spike to melt it through, or a belt hole punch) about an inch down along the edge of the mat and just hang them up. If they are corded side towards the hutch, the outside is waterproof. They are reasonably heavy so don't flap about normally. On really windy nights, wrap a bungee cord round the bottom - put extra hooks at the side so you can just hook them on. They also help to keep the heat in at night and last for years.