This jacket is great, it packs into a fist-sized bag and takes up about half a back pocket when not in use. I bring this jacket with me when there is any chance of rain, wind, or just dropping temps.I am 5'11 140lbs and a Large fits me well, the sleeves are a great length. The torso rides up a little bit, but is really no problem. When going above about 20-25, there is a little flapping in the jacket, but it still has the standard Castelli slim fit. Overall a very good and surprisingly versatile jacket.