rectangular bento tin lunch box is a high-quality metal tableware for outdoor dining, student meal carrying, office worker portable meal storage and food sub-packaging and storage. It features excellent anti-extrusion performance, completely solving common problems of plastic and paper lunch boxes such as easy flattening, cracking and deformation. It is suitable for various pressure-prone scenarios such as daily carrying, backpack storage, logistics packaging and outdoor bumps, with far better practicality and durability than ordinary lunch boxes. Made of high-quality thickened food-grade tinplate, this rectangular bento tin lunch box has a firm texture with excellent toughness and rigidity, laying a solid foundation for anti-extrusion performance and resisting daily external extrusion, collision and heavy pressure impact.

　　Adopting an integral stamping and forming process without splicing gaps or weak joints, the box body bears force evenly and avoids fracture and depression caused by pressure on spliced lunch boxes. The mechanically optimized regular rectangular three-dimensional structure provides a larger bearing area and more balanced pressure distribution, so the box will not be easily dented or twisted under heavy pressure from stacking or extrusion and collision in backpacks. The four sides of the lunch box are designed with widened and reinforced frames, and the corners are thickened and rounded to strengthen the overall frame’s anti-extrusion bearing capacity, effectively buffering external impact and resisting horizontal and vertical extrusion pressure to protect the box body comprehensively.

　　Compared with traditional lunch boxes that are prone to pressure damage and soup leakage, this rectangular bento tin lunch box has outstanding anti-deformation ability and can maintain a neat and square shape under long-term pressure. Its surface is treated with a hardening protection process, which is wear-resistant and collision-resistant, not easy to produce indentations and pits, and remains intact after frequent carrying, stacked storage and outdoor bumps. The stable anti-extrusion performance can not only well store various ingredients such as rice, dishes and pastries to avoid food extrusion damage and soup leakage caused by box deformation, but also greatly extend the service life of the product. It is suitable for daily household use, outdoor camping, bulk supermarket sales and other scenarios, serving as a portable metal lunch box with superior quality and practicality.