WTT (trade) Western Mountaineering Caribou

I have a practically new WM Caribou MF 6'6 left zip. I bought it used (1 night), camped out in my yard and slept inside with it a night and decided I needed something warmer. I'd like to trade for a WM 20 degree bag like the alpinlite but would consider other high quality bags with a similar temp rating. 6' would be nice, this one is too long for me.

Thanks!