I build them 6' wide to accommodate 2 hunters sitting SxS. Usually one of the grandkids or one of my daughters. The first one I built was 6'x4', It works pretty good. But I have found that 6'x6' is much better. It gives you plenty of room for gear such as your pack and a small heater. And you can slide your chair back and be completely in the shadow with just the end of your gun barrel sticking out the window. I built one with my son in law that is 8'x8' for a family blind. You can easily hunt 2 adults and 2 kids with plenty of room for gear. There is even room enough for one of the grandkids to stretch out and take a nap.

This one is 6'x4'

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6'x6'

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This one is the family blind 8'x8'

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