I was out walking this windy morning, there was rubbish and recycling all over the place. Some people had a rock or brick on their bins like I've been doing, but the best idea I saw was bungee cords. Short ones hooked from the back of the bin, or long ones hooked from down by the wheels, up the back of the bin, over the top and onto the front lip. It should probably be attached so it doesn't come off accidentally.
It should be pretty easy for the collectors too - just take the hook off the front, empty, don't bother putting it back on.
Has anyone come across a better idea?