The lightest one is over 4 lbs and rated a zero degrees. So, if you're camping in cold weather just a few nights a year it might be a workable choice just because it's so cheap and you can get out there, but I'd test it on a 20+ degree night before heading out with it.

For nights above 50 degrees it might be too warm and it's heavy, so it's a bad option, even at $20.

But, to have as a spare to loan to a friend it's a pretty decent option

Bill