I have read a lot of guys who really prefer the SOFT bags for that concern. Have you thought about just going with some wolfman bags? They are strong and water tight. Also you could think of doing this...
Originally Posted by jesusgatos
He put all of the footman loops on to give him multiple tie downs, without adding much weight to the bike at all. He says it works out really very well for him and he can pack a lot of crap on that bike.
Just a thought for you to ponder.