the nanook thermal would be the way to go unless you would look at the Yukon thermal or the Voyager stealth thermal or the Jason Mitchell thermal. the portage is a basic non insulted large two man (voyager size) with the bare minimum. if you want thermal and something you can stand up in then look at the thermal models I listed. personally I am running a thermal nanook and love it. light enough for me to get on and off my carrier on the back of my Tahoe and light enough to pull by hand during early ice when you can't drive out with the truck.
