Now that you have all 24 squares made it's time for us to join them together. Your bag will be starting to take form now.
You need to join 9 together in a 3x3 square and 15 together in a 5x3 rectangle.
To join them place two squares right sides together and using thread that matches your base fabric colour over stitch along the length of the two squares. Make sure you stitch them securely as this is what holds your bag together! Repeat until all your squares are joined together.