Cut your fabric:
2- 14”x14” exterior
2- 14”x14” lining
2- 3”x20.5” straps
Iron one of the strap pieces in half lengthwise to create a crease. Open up and now turn in one side to meet the creased middle and press.. Repeat on the other side. Now you have an encased strap. Press closed.
Sew an edge stitch along the open edge. Turn the strap around and sew an edge stitch down the other side. Repeat these steps with the other strap.
Take all four 14”x14” pieces and iron down a ½” on the top, wrong sides together.
Take one of the exterior pieces and attach one of the straps to the wrong side. Place the strap 3.5” from the edge on both sides and baste in place. Repeat with the other exterior piece and the other strap
Place the two exterior pieces with straps attached, right sides together and sew along the sides and bottom using a ¼” seam.
To create the bottom corners, take one of the bottom edges and turn it so the corner makes a triangle. Measure 2” up from the corner stitch. Sew a straight line from end to end, making sure to backstitch. Clip corners. Repeat these steps (minus the straps) with the lining
Take the cardboard and place it directly on the now squared bottom, centering it between the seams. Sew the cardboard directly on to the fabric. Turn the bag right side out.
Insert the lining piece into the exterior piece wrong sides together
Carefully pin top edges together, making sure side seams match
Sew 2 lines, one ¼” from top, and one edge stitch to the inside of the ¼” stitch
Now, head to the library!