I sewed it by hand using embroidery floss held together with fishing wire. I put in a wedged panel at the bottom so it can hold more stuff. I always put loads of stuff in my bag just in case, if you're not like that you can leave the panel out. Extra added bonus: if you're cold, put the bag on your lap. It was a blanket once, it knows what to do.
Afterthought: Why don't I show you the inside as well? Ribbon kindly donated by my crafty mother and tag by Mollie Makes.