Originally Posted By BZH
It is really easy to overheat in a rain jacket while backpacking. Being able to vent is really important or you'll end up just as wet with the jacket on from sweating as you would have without it in the rain.


Not if you use a breathable waterproof jacket...And no water proof jacket is more breathable than the Berghaus HYPER 100 EXTREM...You could even wear it while trail running on a dry day, as a windshell, and you wont sweat in it. Its also ultralight (about 100g in large) and it packs down to a tiny ball that can fit inside your fist. Yes, it's not cheap, but it's to be expected as it's the best there is.
I have the previous Berghaus model, which is even lighter (89g in medium, including the storage pouch), but it is less breathable.