Large Space & PortableThe inner size of the aligner case is 90*86*30mm. The retainer container is perfect for mouthguards, night guards, orthodontic retainers, etc. Also, it's very lightweight, easy to carry, and great for traveling. With Ventilation HolesThis slim retainer case with vent holes can make air flow, which keeps your retainers dry and clean while they are being stored. So you don't have to worry about your retainers smelling bad just after a few hours of storing in there. High QuatityThe mouthguard case is made of food-grade PCTG plastic, strong and durable, BPA-free, odorless. Ensures a tight close to keep dental orthotics safe. And this night guard case is complete with a strong magnetic closure to keep your retainer holder closed tightly.