12″x12″x12″ (305x305x305mm) Internal Dimensions. Single Wall Cardboard Boxes are a budget-friendly and practical packaging choice for e-commerce businesses, online sellers, and general consumer use. Designed for lighter items, these sturdy yet lightweight boxes provide reliable protection while keeping shipping costs low. They arrive flat-packed for convenient storage and easy assembly when needed. Highly versatile, they can be customized with branding or labels, making them an excellent choice for a wide range of products.