I ended up purchasing and personalizing this bag.
I also selected the optional pocket organizer, so I wanted to stuff the bag with things a teacher might be able to use. I put in some gel pens, red pens, personalized note cards, personalized notebooks, cute paper clips that I found from Walmart, a cute clipboard that I got from Staples, and a tiny stapler from Walmart.
Some other ideas that I didn't use were a gift card to Stones School Supply (check where you may have a school supply store in your area), special scissors with different cutting edges (you can get them from Walmart, Target, or any office store).
This is what the bag I gifted looked like stuffed:
Hope this helps you shop for your favorite teacher 😀