Sumikko Gurashi Nesting Lunch Boxes S 230 ml M 350 ml L 540 ml Antibacterial Bento Box. - Design: Sumikko Gurashi character illustrations - Sizes: 230ml, 350ml, 540ml - Material: Antibacterial material (with Ag) - Use: Children's bento box Antibacterial with silver ions Microwave safe New, unused, unopened San-X Co., Ltd. Please refrain from purchasing if you are overly concerned about details. Also listed on other sites. Please confirm availability before purchasing. No returns accepted.