First, get your favorite t-shirt that you don't need anymore.
Then, get chalk or a washable pen or marker and draw your handle. So, draw a line below the neck hem and a line inside the arm seam. I folded my t-shirt in half so the two sides would be even.
Cut out where ever you drew.
After, get a safety pin, a ribbon, and scissors. Use the scissors to cut a small hole in the bottom hem. Then, attach the safety pin to the ribbon and slide the ribbon all the way around the hem.
Once you get the ribbon all the way around, pull the two ends tight and tie a bow.
Now your t-shirt bag is done!
You can use it to put your notebooks in when you go back to school or bring your favorite toys on road trips.