We have four slides with toppers, the only one that flaps is the large one, I tossed a 2" nylon web strap over the length of it and bungeed a 2 liter bottle on each end about half full of water. Stopped the flap dead, not enough weight to tear or wear the edges and also acts as a wick that draws all the water off the topper. After surviving having tornadoes pass within 2 miles of us and 2 weeks at Mayport and a winter in Statesboro with constant wind they all look like they are still new... Dave
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