It's been a looong time but i made one just like this in 6th grade home economics, no idea if it is still around or not but it was pretty simple. Outer layer, liner, webbing straps and a zipper. Sew your webbing straps to the outer layer, bind the layers together and then add the zipper. You could also bind the zipper in when sewing the layers together and get it all in 1 run. Wool wicks moisture and makes a good lining material.
