User Review: The North Face Bighorn
Source: bought it new
Price Paid: $99
Definitely NOT a 20-degree bag.
Though this bag is no longer available for purchase new, I thought I'd add my two cents anyway because I want to echo the sentiments of the other reviewer. I originally purchased two of these bags for a summer backpacking trip to the Big Horn (coincidence) mountains. The bag was great there. It was big and roomy, temperatures got down into the 40's at night, and I slept wonderfully.
A few months later, I used it in the Wichita Wildlife Refuge in my old 3-season Walrus Tristar tent with the rainfly on and zipped closed, and slept on a big, thick Therm-A-Rest Camprest sleeping pad. Temperatures hit in the 28 to 32 degree range outside, which meant it was probably 35 to 40 degrees inside the tent. I shivered all night, and I'm warm natured.
There is no way this comes close to being a 20 degree bag. If you find it used for cheap, and want a big sleeping bag that you will never use below 45 degrees or so, it would be a decent purchase.