Problem: I lost the fabric :P.
One say when I was visiting the thrift store, I found an old army laundry bag, olive drab with a few holes. It was only 2 bucks so even if I never used it, I figured it wouldn't be much of a loss. Problem 2: Too damn big to carry anywhere. So I figured I'd turn it into a usable backpack.
Step 1: Measuring.
-7 inches from the top of the bag and;
-12 inches from the top of the bag
Do this all around the entire bag.
Step 2: Cutting!(Not you emo kid!)(No for real, emo kids are cool)(Sometimes).
Start with the 7" line (or the 12", It really doesn't matter) and cut across, and follow up with the other. Set them both aside.
Step 3: Ok.
Set the middle piece aside (you'll use it later).
Take the top array (the part with the hook and loop thingies) and slip it over the main bag top. make sure the metal spring loaded part is facing the table, and the pack straps are facing up. Line the cut edges up and make sure they are even. Pin it together every few inches.
Now you are ready to sew!