I'd be looking at a Western Mountaineering bag that fits you... you can get something with a gore windstopper shell to handle external moisture if it's a concern, or just take along an over-bag.
While there are other good bags, I've been using WM bags for 25 years and wouldn't use anything else. We currently have three in the house...
This ^ .
Get a coat too , once you put it on OMGoodness are down coats nice -light too & pack down like a cantalope . Multi -use item , wear when glassing , around camp , when sleeping and looks great around town .
