Originally Posted by sn1p3r
I am using the smaller one from Touratech and it's fantastic. It has stiff sides and is big enough for most tid bits but quite small in size. The lid was a bit floppy for my liking so I have cut a piece of thin plastic from a tupperware container in the shape of the lid and fitted it inside the lid pocket so you can't see it. The whole thing is now rigid.
I do use the same on my F800GS guide bike and it matches all my needs as a tour guide (can cary the photo camera, water camel bag, safety kit, maps etc.. etc...).
Only conczern is to keep the sticky underpart clean to avoid scratches on the paint.