I daily use the ILE bag, it's a really good product and seems to have the caracteristics you're looking for.
Apols if you've already covered it but what front rack is that?
Soma ! Really strong, fonctionnal and good looking I use it with Ortlieb panniers to with no difficulties.
@sensom started
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I daily use the ILE bag, it's a really good product and seems to have the caracteristics you're looking for.