Olà Matthias,
yes indeed, most of the trip through Chiloè (Chile) and then in the mainland of Chile along Rio Palena till to reach Carretera Austral (more than one week !!!) has been under a continuous heavy rain. The new bagages (Vaude Discovery series) did withstand excellently the rain, no infiltration at all not even from the zip-pockets but, you know, it's very new equipment so I can't say now how long they'll last. Next September I'm planning a long trip in Brazil and so, surely, I'll have the opportunity to double check again their behaviour.
I'll let you know.
Ciao.
Corrado