You will need
  • Soft cotton fabric 90 cm wide – 3.6 m;
  • a waterproof fabric or fabric with water-repellent impregnation (90 cm wide) – 3.6 m;
  • separable zipper (length 2.5 - 2.6 m;
  • interlining width 90 cm – 10,8 M.
A piece of soft cotton fabric, cut in half into two equal pieces with a length of 1.8 meters, sew them along the length, the seam is smooth on the inside, wrapping the edges to the sides. This will be the inside of your sleeping bag. When choosing fabric for her, keep in mind that it is better to use not very easily soiled colors, because most often the bag is used in field conditions, where it can quickly get dirty.
The second piece of waterproof or impregnated cloth is also cut in half into two pieces with a length of 1.8 meters, sew both pieces along the long side. Sew both of the resulting pieces of different fabrics together on the side where there is a middle seam. This is the top edge of your sleeping bag.
Interlining cutting into six pieces with a length of 1.8 meters each. Put them in two stacks of three layers each.
Put stitched pieces of waterproof fabric and soft fabric on the floor seams up. Soft cloth wrap, and a piece of waterproof fabric across the seam, place the two stacks of nonwoven layers adjacent to each other, butt to butt. Take a needle and thread and baste the interlining to the layer of fabric, securing it around the perimeter and in several places inside to layers of nonwoven fabric was securely fixed to the surface of the fabric.
A piece of soft tissue, expand and put on top of the interlining that the seam running down the middle, was laid across two stacks of layers of nonwoven fabric. Baste the fabric around the perimeter and within large stitches.
Take a sewing machine and retreating 20 cm from the top edge of the sleeping bag, make a parallel to 8 lines of large stitches. Remove all basting.
The resulting fold the quilted square in half along the middle seam, tuck the edges and vsheyte zipper from the fold on both edges.