On my Germany-Portugal-Germany 6000 km (55 stages) Tour Okt.'12 - Apr '13 I passed through some severe storms. The bag has a hand made me loyal service, that is they serh practically in the handlings, only had the rain cover was familiar repeatedly but always disappointed. Unfortunately, I also a zipper on the large main opening has jumped out of the socket and although I am quite adept and tool case had / had access to tools which was irreparable. Good, because I lived more or less on the bike, I had to work out the top lid of the bag (closure of Hauptffnung) very often and, but not hot must that the zipper should abkacken so quickly. The zippers on to run very easily. What I can say as a plus point is that the customer service of R & K is very generous. Please think carefully whether you should buy the bag really at this price (without handlebar adapter)!
