This bento box is a bio-composite of 70% bamboo fibers and other natural materials. Bamboo is a fast-growing plant that thrives without fertilizer or pesticides, making it the perfect resource to harvest again and again. Fashionable design meets a traditional bento box that lets you carry your meals in style. Outer band helps keep the bento box packed together when on-the-go. BPA free. PVC free. Phthalate free. Do not microwave. Dishwasher safe (top rack only), hand wash recommended. One-piece natural gift box included. This product contains bamboo fiber, which is a natural material. Color and pattern variances are to be expected.