I'll be going on an elk hunt the first week in November in wyoming. It will be a horseback hunt. My main bag is a BA lost ranger +15 but that's not going to cut it on this trip I'm thinking. The best bags in the -30 range that are small and light enough for horses are obviously pretty steep on the price. This will be my only late season trip away from a vehicle this year so I'd rather not spend the cash for a bag I'll use once. Has anyone doubled up bags before? I also have a 30 degree down bag I could double with my 15, but wanted some comments on that before I did it. Thank you in advance!