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Very good, using the old fashion material of duck cotton mean that it's much more tightly woven and are extremely water resistant, it can be further improved by waxing it on top, it's also very repairable and you can put some swimming credential patches on it for additional rad point.
The Ortlieb despite being heavier is very likely to be completely waterproof, especially the roll top design.
@edscoble I hadn't realised quite how much heavier the Ortlieb plus are!
Whats the waterproofing like on the Carradice super c front panniers?