My son is headed to a small middle school in the fall. The kids are not allowed to carry backpacks between classes, only binders. In elementary he kept his kit on the classroom counter and used it as needed. But now he will rotate classrooms. Hopefully he'll be willing to carry the kit but I certainly don't want it stuffed in a locker. Any tips would be appreciated. He's on an Omnipod so the PDM is not attached to him. Thank you.