One Piece Reusable Tyvek bag (sack)

Step 7 Making the bottom of the bag

Using the folded guides, gently push the bottom of the bag so it "flattens" out a bit, then crimping along the edge with your fingers, create a box bottom as shown below. It make take some doing but this is why we burnish the folds as crisp as we can. It makes this part of the process easier. Repeat this mantra: "its like doing origami....breath and fold".