I was curious if anyone was familiar with Ortlieb panniers? I like the idea of a complete waterproof bag, but how do they hold up in other areas such as durability and organization. I currently live in a high altitude desert, i.e. Colorado, so rain is not a problem here, but I do plan to travel to greener pasture where rain is an issue. Are rain covers on other panniers as efficiant as they claim to be? Any thoughts are greatly appreciated.