KoopaThe size Medium sample weights in at roughly 9 ounces.
Also worth noting is the fact that these great little jackets are packable into a handy little pouch (all included into the right pocket of the garment); see image below.
Sir_BigzalotBoth will fit, but since you're pretty tall you may consider the xxl for it not to be too short/cropped on you. Again, it depends on how you want to wear it or how much you will layer it with other garments.