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!)
Place one of your sleeping bags into the other one, if using a polar fleece bag place it into your regular sleeping bag. Making sure to push the inner one tightly to the bottom of the outer one. So the zippers are touching.
Thread your thread or floss threw your needle. Pulling the two ends together, Lick you index finger then wrap the thread three times around your finger. (if your using diaper pins skip ahead to step 11
Then rub the thread down off your finger with your thumb. Then pull the ball you just made tight. You now have a large knot.
Pinch your two sleeping bag’s zippers together at the bottom, then run your needle threw BOTH of the zippers just below the zipper into the cloth part of the zipper.
Pull your thread half way threw the zipper, then take your needle threw the thread as shown, which is between the two pieces of thread that you tied into the knot.
this will keep your knot from pulling threw the cloth in the night or undoing your sewing