The boxes shown are available in multiple colors, including green, dark gray/black, pink, and blue.
Some models feature a removable stainless steel inner tray with multiple compartments, typically three or four, for food separation.
The outer shell is often made of food-safe polypropylene plastic, which can be insulated.
Certain components, such as the plastic outer box (without the lid), are microwave-safe for reheating food.
The design is compact and portable, making them suitable for school, work, picnics, or travel.