FYI...this would apply strictly to spot and stalk/still hunting from the ground. I am not a tree squatter.
Well,I do both.
All of September,I'm chasing Elk and Deer in CO. High country.
October and November I'm on the farm in IL.....tree squatting?
Actually killed my buck on the farm this year from the ground,but was in a tree earlier in the day
I use my puffys for both.
I have a Mountain Hardware Ghost Whisperer. 7-8 oz for a size large. I use this mainly early season Elk/Deer.
If I don't tag out early,and the weather invariably changes mid season,I start packing with my Western Mountaineering hooded flash. I believe it is 10.5 oz.
Very warm,and very light weight.
Same basic scenerio on the farm.
I start early season(Oct.) with the MH and as season progresses I change to the WM.
Montbell makes the lighest puffy as mentioned above.
The Plazma 1000
But of you compare that to MB's other UL puffys there is only about a 2 oz difference and much less in price.