Thats a nice solution to the drybag pannier mount.

I imagine that if it did start to fatigue it could be replaced at a Dollar General(they seem to be everywhere). A sharp knife and some simple tools to replace hardwear.
Some zipties and string for emergency repairs while you are testing it.

UL gear requires a little more fuss and care than heavy stuff, but its not hard to do.
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And thats a great sewing machine!