Not what you were asking, John, but would the Rivendell Back-a-bike Bags work for you? I love them for precisely the reason you are asking about the attachment system. Riv’s are attached with the old school leather straps on top and sold nylon click buckle on the bottom. They are solid on rough stuff and I have no worries of them breaking or detaching, despite rock and tree bashing (and that Scottish cloth is stunningly hearty!). Riv. commercial over. Grin.
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