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Since this is the only relevent thread to post in, I'm going to do ahead and ask. Does anyone here have experience with Big Agnes or Sierra Designs bags? I have access to both through my job's pro-training and I'd like to prepare for some winter camping. I'm in the ozarks so I don't expect to be /out/ below 20° but I also like to visit CO when I can. I know both BA and SD have that bottomless thing going on with their insulation, and SD has some zipperless designs that look interesting. What are your thoughts /out/?