I begin by cutting out the pattern of my sleeping bag making both equal sides then sewing in the 2in no-see-um mesh baffles. I then sewed both sides together to the baffles and seal one side by sewing it together and then the top and the bottom leaving one side of the bag completely open to stuff the down inside. I then cut two circular pieces of material for the foot of the sleeping bag and sew that in. Leaving about a 3-inch opening on the seam so I can stuff it with down and then stuff it went down and finish sewing that in. I then stuff the bag with down that is pre measured and weighed so I know exactly how much should go in each baffle I use between 1.3 ounces in 1.75 ounces per baffle depending on the size of the baffle. Once the bag is stuffed and then so the other side shut and begin working on the zipper and I insert a draft tube that goes inside along the zipper it's about 3 in wide and has about six tenths of an ounce of down in it. Once the zippers are installed, I complete it by making sure I've made a loop at the top for a drawstring to go through and it is complete. Total time to make the sleeping bag takes me about 12 hours to 13 hours if my down has already been washed dried and pre-weighed into bags.