LEGO brick wall made out of Muji storage boxes. They have dividers for extra segregation, plus Muji has well fitting additional small boxes. : r/LegoStorage
Polypropylene Storage | MUJI
Storage & Organizers | Home Organization | MUJI USA
Muji box - Etsy Österreich
PP Storage Box - 34x44 S | MUJI
The Cull: Our 10 Favorite Storage and Organization Products from Design Darling Muji - The Organized Home