The 8 Best Lunch Boxes for Kids of 2022 - The Spruce Eats Dimensions: 8.5 x 6.3 x 3.1 inches | Weight: 1.75 pounds | Material: Stainless steel and BPA-free plastic 1. Final Verdict. The Bentgo Kids' Lunch Box is our favorite option for younger children thanks to its durable and leakproof design.