Originally Posted by
ShartRate
This is what I'm still leaning towards
I might have to ask the guy at my LBS what he thinks, as it's still not clear to me how Ortlieb measures their volume.
FWIW, just looking at the product page I linked to ... it states roughly 16" tall and 12" wide (or 1.33:1 ratio). that pretty well matches the photo on the product page with the top rolled down. the ratio in the above photo looks more like 1.5 or 1.66:1 with the tops unrolled. So, I would assume that it's the volume fully closed ... and that's what I'd demand to know as a German consumer.
Given all that, I'd still buy local.
edit:
http://ortlieb.com/_pdf_en/backrollerclassic.pdf
With "tech specs" it looks like they measure it closed (as shown in the photo). Buy local.