As a former teacher, these are my thoughts.. Nothing smelly. Lots of teachers are allergic. Totes with lots of pockets. Make them strong and big, because they will get lots of use. Mug organizers, a cover for over the computer when not in use, notecards, ipad cover, potato bags for when they nuke their lunches, cup cozies to help keep their coffee warm, little sacs of snacks, i.e. gorp, for late afternoons at school, or just a nice note telling them how much they are appreciated. For elementary school teachers, a bag of "goodies", i.e. scraps of fabric, buttons, sequins, trims, any unused craft items to be used in the classroom to create mother's day cards, things they can create if they have a friend in a senior citizen home, etc. etc. would be well used!