①. Product parameters: Material: silicone + PP Color: blue Size: - 350ml: folded size: 13.2 * 3 * 9.8cm, unfolded size: 13.2 * 6 * 9.8cm - 500ml: folded size: 16.5 * 3 * 10.8cm, unfolded size: 16.5 * 10.8 * 6.5cm - 800ml: folded size: 18.5 * 12.2 * 3.2cm, unfolded size: 18.5 * 12.2 * 7cm - 1200ml: folded size: 21.8 * 13.8 * 3.2cm, unfolded size: 21.8 * 13.8 * 7cm Quantity: 4 pcs. Scope of delivery: 4 * foldable lunch boxes ②. 【Material safety】: The containers are made of 100% food - grade PP and silicone, non - toxic and odor - resistant, environmentally friendly, BPA - free. The inside surface is ultra - smooth to prevent grease from accumulating and is easy to clean. ③. 【Set includes】: 4 containers: 13.2 * 3 * 9.8 cm (350 ml), 16.5 * 3 * 10.8 cm (500 ml), 18.5 * 12.2 * 3.2 cm (800 ml), 21.8 * 13.8 * 3.2 cm (1200 ml). 4 different sizes are suitable for different situations, such as picnics, travel, work, etc. ④. 【Ingenious Design】: 4 - way snap - lock lid, leak - proof silicone sealing ring. There is a small valve on the top of each container to release water vapor. It allows for easy and compact storage, folds to 1/3 of its original size for easy folding, saving more than 60% space. ⑤. 【Safe to Use】: It is suitable for microwave ovens, dishwashers and refrigerators. The applicable temperature is - 40 °C ~ 120 °C. Open the release valve if heating in the microwave and heat for no more than 5 minutes. ⑥. 【Ideal for Food Storage】: It is suitable for storing food. It is easy to assemble and carry, and is a good lunch partner for children. It is also suitable for adults to develop healthy eating habits and is a good choice as a gift.