I haven't used this much since I bought it, and it's been stored at home. There are no stains or scratches. Coffee Filter Case For commonly used trapezoid coffee filters For 1-2 people / for 3-4 people, both sizes can be used Approximately 50 sheets can be stored Since it's for both 1-2 people and 3-4 people, you can store both sizes together You can quickly take out the size you need depending on the purpose Can also be used for KONO-style filters