Canvas Shoulder Bag

I search my bag in white canvas, which passes over your shoulder, like my boyfriend is going to draw manga and anime everywhere. I looked everywhere for one and was wondering if someone could suggest another place to try, or if you know of anywhere that sells them.

Thank you

You might want to try a place like JoAnn Fabrics or Michael, if you have not already. They usually have bags like that in Section crafts. I bought a little before shooting myself. If you do not find it there, you can try to search online. I do not know the name of a website on the top of my head though.