This pattern says it used trapilho yarn which is apparently a heavy duty yarn/wire? Not sure - some equate it with t-shirt strips but I liked the idea. Just 5 granny squares connected to make a basket/box
This takes the traditional granny square afghan to a whole new level! The three-color Weekend-Wonder Giant Granny Square Throw from Red Heart Yarn is made from the center out in one piece, so that there are no seams to sew once you finish.