Haven’t had the time to do a full write up, but here’s some info
Size M: 13.9 ounces
Fill power/Fill amount: 800FP/Unclear from EMS support (claimed to be 5 ounces from users)
Loft:~1.5″ (not that it means much)
Back length: ~27″
Arm length: ~26″
Thoughts: Seals up extremely well. Shape is a bit boxy, with “interesting” construction in the underarm. A little larger sized than my Montbell Alpine Light for reference (Montbell back and arm length around 24″). Accommodates layers underneath (would fit another puffy with room to loft). I would not trade for the small however.
Internal pocket stuff sack is pretty useless; too much effort and i’ve had the zipper snag every time i try. Comes with 3 outside pockets, wrists have elastic, and has a draw cord bottom to sinch up. YKK zipper with draft guard.
I have a Uniqlo down jacket as well. Mine weighs right about 8 ounces, but I can’t take it into the temperatures i could with the EMS jacket. I got the EMS for $80 and have zero regrets.