You don’t need to spend $100 or more on a good winter sleeping bag to stay warm. Especially when you will most likely only use it 2 or 3 times a year, and who wants to store that. I’ve found after about 15 years of camping with the Boy Scouts in both Michigan, and Florida. This works much better.
Items your going to need.
2 - 40* or warmer sleeping bags (if your sub 0* camping)
40* sleeping bag and a polar fleece sleeping bag (the polar fleece bag will add about 25* to your bag)
A sewing needle
thick thread or embroidery floss
2-3 Diaper pens (they have to be diaper pens you can get them from the baby section at the store or like Babies R Us where they sell the cloth diapers, because regular safety pens come undone in the middle of the night and stick you!)