The bento box is made of polypropylene PP5, which is a high-quality reusable plastic that is known for its sturdiness and is completely recyclable. PP5 material is food grade, BPA-free, non-toxic and chemical-free. Easy to clean by hand or in the dishwasher, and can be used in microwave ovens, dishwashers and freezer compartments. This bento box is 8.5x4.64x3.46 Inch, the weight is nearly 500g. Lightweight for carrying with its handle or inside the bags. Fits the needs of kids and adults. 8.5" L x 4.64" W x 3.46" H