Zip 800 - 600
Love the 600 bag - got the 800 for 2 scenarios: my GF if she comes along, or for me in colder weather.
#1 question I had was will the left 800 zip to a right 600?
Answer is: KINDA!
Not what I hoped, zippers are same length but start at different points on the bag. Zippers are also 2 different guage teeth, meaning it will "zip" up but it probably isn't good for it.
Wanted to post for anyone considering something similar...
Haven't tried the bag for temp rating.