I take an XL usually (5' 9 1/2", just a regular stout XL size), and my parka fits perfect. Sleeve length is great, with arms extended it doesn't pull up short over my wrists. Super light, so yeah, I could see rolling it up for a stuff sack. Has a rounded dropped section at the rear to cover your hiney, so it won't creep up if you bend over or whatever, kind of like the profile you see on bicycle riding jackets. Two big zippered outer side slash pockets, and two huge, deep open top mesh pockets inside, one on each side. Only thing I haven't tried yet is it's rain or snow resistance. The fabric doesn't look very waterproof but I could be wrong. Likely best used in cold, dry weather, or as a liner under a waterproof wetskin, poncho, or something. And the colour is actually a very, very pale OD green, not grey, at least mine is, not grey as reported earlier, which I like better than grey anyway.
BTW, regarding the US FLC vest, (offered as a package deal with the parka), I had a problem getting the front main buckle to tuck in out of the way of the zipper, until I figured out that whoever packaged it had threaded the waist web belt through the main front fastex buckles backwards. After I un-did and re-routed the web belt the right way, the straps now lay back BEHIND the buckles properly, allowing you to tug on them and cinch it tight through the vest's waist tube at the rear ends of the opening, pulling the buckles inside the front of the vest better and out of the way of the zipper. Make sure you orient the buckles the correct way so they catch tight on the belt and don't let it slide through easily.
A simple fix, but just thought I'd mention it for anyone fumbling with theirs still. ;-D
Cheers.