I have the older side zip one in a long / wide 0 degree. I'm 6'3 250 plus and it fits great. Under 4lbs for a synthetic that fits and is packable. And like all Kifaru products it's very well made. That being said I freeze in it below 40 degrees. Now I am a cold sleeper, but I have a Big Agnes 0 degree that is warmer, and Big Agnes has a reputation for not being as warm as their temp rates. I love Kifaru gear but am considering a down bag because I hate being cold. Supposedly the new center zip bags use a different insulation and are warmer. Just my experience