420ml Japanese New Style Drinking Tumbler Breakfast Cup With Lid Portable Drinking Cup Bamboo Fiber Cup - Double walled insulation - Handcrafted natural bamboo exterior: 100% recyclable, unique and stylish. - Durable, food safe and highly resistant to absorbing color, odor, taste and bacteria. - BPA free: so you don't need to worry about your drink interfering with your natural hormones.