Originally Posted by
ilkphillybkchks
At the risk of letting thieves know... Ortlieb bags attachment system is the best I've used. They pop off with a pull of the strap, but have never come off on own their own during the 16,000 plus miles that I've ridden with them. Not a trunk bag though, they're full size panniers.
Ortlieb
does make a rack trunk system. It's used on their
Bike Box and
Trunk Bag as well as other cases. They even make an
adapter that can be used with baskets. I've used the basket adapter to retrofit bags to the Ortlieb system. None of the Ortlieb bags are cheap but the adapter is far better than just about any other system I've run across with the exception of the Topeak rack. But the Topeak bags can only be used with their rack where as the Ortlieb adapter can be used with any rack.
Ortlieb's Racktime line also makes an adapter for their racks. The bag I adapted was a Racktime Trunkit.