WTB 10-20° sleeping bag FS/ FT Western Mountaineering Caribou

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I'm looking for a bag in the 10-20° degree range. Ideally something small and light since I plan on carrying it around for a year. The WM apache is the ideal choice for reference but I'm open to whatever else is out there.
I've also got a Western Mountaineering Caribou that's like new if anyone is interested.
Cheers -Mike