Fold your main fabric right sides together and sew one short side and one long side.
Fold the raw edge under 2 inches and iron.
Turn right side out and iron.
Fold the ends of your small piece under and pin to one side of your bag (this is your strap loop). Sew down.
Pin the unsewn edge of the strap to the inside of your bag and sew around hemming the top of your bag while tacking down the strap.
Take your small piece and fold in halve and sew the long edge. Turn right side out and iron.
Fold your strap in half lengthwise and sew one short edge and the long edge.
Thread your strap through the loop and tie.
Use Tulip glow paint to accent your bag and allow to dry fully.