fully waterproof lightweight jacket

ive got 3 rain jackets and only 1 keeps me dry the one what keeps me dry i use for work as its a portwest pvc one but too heavy for long rides, my montane featherlite was useless and my ron hill let the rain through after 10 miles, anyone tried the altura strada, or any other lightweight one to fit in back pocket and completely waterproof for long rides in the rain
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Goretex is fully waterproof, so is a bin bag. Neither stops you from getting soaked in sweat though. Closest I've come to finding something that is fully waterproof but is good at "breathing" is eVent. I believe some of the Montane waterproofs are made from this fabric. Montane Feartherlite isn't designed to be fully waterproof it's made from Pertex, which is light but has excellent windproof qualities. It has a water-repellent coating, but this will wear off pretty quickly and is useless once it is saturated.
I think it's more important that you find something that is comfortable to wear, even if you are wet. If you don't sweat at all though, Gore Tex Pac Lite should do the job, if you feel like stumping out for it.
It has some vents at the back and it is really lightweight. Fits easilly in a single back pocket of my jersey with room for a pump.
http://www.wiggle.co.uk/p/Cycle/7/Altur ... 360031866/
You can spend three figured amounts of the folding stuff on something which claims to keep you dry but doesn't actually work. Disheartening.
http://www.wiggle.co.uk/p/Cycle/7/Altur ... 360031865/
Won't roll up that small though, but could probably get it into one of the cram pack things that hiking stores sell and into the back pocket from there.