This is a black mesh pen case with a gusset from MUJI (Ryohin Keikaku). It has an inner pocket, which is convenient for storing small items like erasers and rulers. - Color: Black - Material: Mesh - Size: Approximately 17cm x 10cm x 8cm gusset I bought it at a MUJI store in December 2025, and I've only put items in it once. It will be folded for shipping.