Sleeping bags

[MSM1970]

I just returned from an overnight trip to FG. Since the nighttime hours after 10 or 12 aren't very productive we decided to try sleeping in a separate tent. My brother just dozed in his chair while I tried to get some sleep in a bag on a cot. Didn't work out so great. The bag was too small especially since I was wearing all my clothes including a jacket and coat. I could barely move but I didn't get cold. Would probably have frozen if I had dressed down to my jammies. Anyway, I'm on the lookout for a big, roomy, warm, rectangular bag. I hope some of you can make recommendations. I don't think $100 0° bags will do it. I want something like -20 to -35° and expect to pay at least $150 or so. It also needs to be roomy. Anybody help?

yes you want the 0 deg, then you get some fleece blankets in it,  just like how you layer your clothing to be out in the cold, get nice fluffy ones,  sew up the bottom a zipper if needed,  get or make a cowboy bed roll, mine is homemade out of canvas tarps, remember to layer, I have been tent camping in on the late season elk muzzle hunt and deer before then ,  layer then you can adjust cover per how cold it is,