Best Eco-Friendly Lunch Box: 3-in-1 Stainless-Steel Bento Lunch Box This durable 3-in-1 Stainless-Steel Bento Lunch Box ($29) can hold up to six cups of food, making it a great, eco-friendly option for even the hungriest of kids. It has three compartments to keep their food in it's dedicated space and its crack-resistant. Image Source: amazon.com 3-in-1 Stainless-Steel Bento Lunch Box $29 from amazon.com Buy Now