First cut strips of duct tape about 12 inches long and fold them hot-dog ways sticky-side to sticky-side. (you can make them shorter for a smaller bag) 20 of each color. (you can use less if you want a smaller bag) 10 will be for the front panel and the other 10 for the back panel.

Next tape down 10 of your strips to the non-stick baking sheet (or any other non-stick surface). Make them as close as you possibly can so you won't have holes in your finished bag.

Next you want to weave in the other color, as tight as you can.
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It should look something like that. Hopefully not exactly like that, but you get the idea.

After that put tape along he bottom to keep the weaving from coming undone. Then peel it up and do it all again for the back panel!
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should look something like that.

Once you have both your panels made you need to start constructing your bag! To do that you want to make a duct tape sheet that is as long as the bottom of your bag, two strips wide.

Make panels for the sides of you bag the same way you made the bottom panel, but long enough for the sides.

Now all you have to do is tape it all together! Tape anywhere else you deem necessary to finish it and make it look clean. You can cut cardboard pieces to fit in the inside of your bag if you want it to have a little bit more of a stable shape.

Make a handle for your bag out of a duct tape strip and tape it on. Or any thing else you can make a strap out of.

I put vellcrow on the inside of my bag to give it a closure. You can put strings to tie it or a zipper or you don't even need a closure!

Now show it off! I got a lot of compliments on mine!