These are weekly hole-punch bathroom passes.
Each pass allows for a bathroom break twice a day.
Students hole-punch (a stamp and sticker system can be used as well) each time they use the bathroom.
This can help students regulate their breaks and encourages less time spent on leaving the classroom.
For an extra instinctive, you can have a weekly raffle for students who did not use all their breaks.
Clipart is by Winchester Lambourne http://www.teacherspayteachers.com/Store/Winchester-Lambourne