Having tired a number of hunting chairs over the years I bought one of these this year. It doesn't swivel, but is the mot comfortable chair I've used, and I added 2 straps to it so I can carry it flat against my back. It's narrow enough that it doesn't hang up in brush. I find that backrest makes a big difference in how long I can sit still and be comfortable.
http://www.wingsupply.com/shop/Scrip....asp?SKU=82247