With a full Ortlieb, properly hooked, I tend to only get a bit of rattle. Have also wrapped a lot of tape on my rack at the contact points and get that bottom hook as tight as possible. I guess it is the price you pay for the ease of removal. It's usually the plastic bit at the bottom that clangs or if you pack stuff without padding out the bottom with a jacket or whatever.
With a full Ortlieb, properly hooked, I tend to only get a bit of rattle. Have also wrapped a lot of tape on my rack at the contact points and get that bottom hook as tight as possible. I guess it is the price you pay for the ease of removal. It's usually the plastic bit at the bottom that clangs or if you pack stuff without padding out the bottom with a jacket or whatever.