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Step 1: Cut Insulation
Measure and cut 2 pieces of fiberglass insulation to length.
Step 2: Join Pieces
Duct tape 2 pieces together
Step 3: Zipper
Staple zipper to both sections as shown.
Step 4: Paint
Spray paint you new sleeping bag nice earthly color.
Step 5: Install in Tent
Put up tent , install bag and test it !