Step 11Add the Strap
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Figure out how long the strap should be for the laptop owner. Add several inches to this amount for hems and for the strap adjuster (I added an extra 5"). Cut the strap into two pieces (one about 10" long) and hem all four edges by rolling them over twice 1/4". Put two edges of the strap into the adjuster, following the instructions on the package. This will involve sewing one side of the strap onto itselt, stitching an "x" inside a square. Use the same stitch pattern onto the sides of the bag. I did this by hand.
Finally, cut two additional pieces of strap. Hem the edges of these as you did the others. Attach these to the parachute buckle, following the instructions on the package. Attach one strap and buckle half to the front flap of the bag, and the other strap/buckle to the front of the bag.
C'est tout!