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THANK YOU for the heads up, I've been meaning to grab one of these for ages, mainly for development of the touring range, this is a godsend.. especially after just spending stupid money on machinery.
The way I do it, is I have one built in/tacked in support between the two layers, which goes up the sides and along the bottom, and then a removable support on the closed side to the rider. This means you can remove it if you need to pack the bag flat for a trip (the only real reason these stiffeners are removable).
Tubus Tara for £45 at Wiggle, around 70 elsewhere: http://www.wiggle.com/tubus-tara-lowrider-front-rack/