That's actually really cool! The stitcher in me wants to take a sewing machine to the edges but it's great just as is and anyone could make them up. Good for shopping, very frugal and love the upcycling element as well.
I looked for a video how-to, and here is a demo of a different version. It involves duct tape but is strong, and can be used for carrying groceries. Also a good kids' project. http://www.youtube.com/watch?v=-6yDxK68OZc
Invasive plants are Earth's way of insisting we notice her medicines. Stephen Herrod Buhner
Everyone learns what works by learning what doesn't work. Stephen Herrod Buhner