Mollydog, to answer your questions, my Nelson-Rigg bags are the "Adventure Dry-Survivor Edition" (there's a mouthful) model and have stiffener panels only in back. The material has the look of welded pvc (I could be wrong about that) but in any event is somewhat grippy and resistant to easily receiving a bulky inner bag into which stuff has expansively settled towards the bottom.
My Givi cases are plastic and hold only, I believe, 21 litres which is truly, non adventurously dinky.
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