Help your students remember procedures when using the bathroom! Print out, laminate and post near bathroom or inside bathroom on the doors as quick reminders! In my classroom, I have a special method I use to let other students know if the bathroom is vacant or occupied by a red/green tag. I just glued a red square sheet of construction paper to a green one, then laminated. I then placed a piece of velcro on both sides as well as on the bathroom door. The green side showing means the bathroom is available and the red reminds students to knock and/or shows the bathroom is in use.