Likely go with the single mack then, as I walk-sit-walk-shoot-work-whine-work-stumble all day long when hunting
Something to remember, is that the single mack is a slightly heavier material than the double (26oz vs. 24oz). IMO, the biggest plus for the double mack is the caped shoulders. The lower back area where it's only a single layer is actually a little lighter than the single mack. I don't find a huge difference in the feel of the two coats in the sleeve area either.
I own charcoal, green, and heather grey double macks. As someone posted earlier, you DO look for blizzards when wearing them.
