BackSew a seam along the line highlighted with the blue yarn to make box corners.
This large tote bag is simple to make. First, make a selvage quilt. This one is 21" wide x 38" long. I decided to add some selvages on an angle, as you can see in the bottom photo. When you have finished binding your quilt, fold it in half, selvage sides together, and sew the side seams together. Make box corners by sewing a seam in the spot highlighted by the blue yarn in the photo above.
I like to insert a stiff piece of cardboard in the bottom of the bag to give it some support. First, cover the cardboard with batting then with fabric, to give the "floor" of your bag a nice feel. This floor is removable.
The two handles on this bag are 33" long. To make the handles, selvages were sewn onto 5" wide strips of foundation fabric. Then batting was added to make the handles feel padded (not thin and whimpy). Fold the handles lengthwise (folding in the raw edge) and sew using a quilter's walking foot to accomodate the bulk.
This bag is sure to be a hit at your next guild meeting or quilt show! Hold on tight:)