on this note, I used cordura panniers for many years, and one of the things that I liked with my ortieb rollers with the thinner material, is that when totally wet after being in the rain, I have always preferred how the ortliebs arent as wet and heavy when bringing them into my tent, and they dry out faster.

all in all, I find canvas bags and cordura heavier than my ortliebs, and they seem to stay wet and heavier when wet longer than the ortlieb matierial.

just my personal preference, but one that made me buy the ortliebs, which have worked and lasted very well for me.