This lunch box is made of food-grade Silicone material,FDA Approved and BPA-Free, Non-toxic and odorless, no harmful to human health,Also which is durable and reusable for thousand times, the lid is made of strong polypropylene for resistant of high temperature. These containers can be collapsed down to 1/2 of their height.It won’t occupy much room in the refrigerator ,microwaves,and you can put it even in your schoolbags when you take bento lunch to school. This is perfect solution for a wide range of foods storage, you can choose the size to take bento lunch,fruits,or any snack,etc. to school ,office,or outdoor activities.A customized logo is available.It’s lightweight,ideal for post offices,courier express companies,logistic and parcel shipping companies,packaging wholesalers,mail order companies,shipping supplies sellers,office stationery suppliers,online retail stores,home use. Measuring 33oz, this custom foodgrade silicone foldable lunch box. Usage Scenarios: Office supplies, school stationery, corporate promotions, trade show giveaways. Customization available: Print your logo or customize packaging and color schemes. Product Highlights: Portable, durable, practical for daily use.