Really Useful storage boxes are perfectly stackable, with or without a lid Resistant to extreme temperatures from -15°C to +80°C Minimal adjustments of the side panels to maximize storage space, ensuring stability of the contents during transport Fully flat and reinforced bottom The locking mechanism keeps the box and lid together Thanks to the transparent box, you can always see the contents Boxes of different sizes are stackable with each other Ideal for storing various office supplies or other products.