PP material: This storage box is made of environmentally friendly pp material, no peculiar smell, non-toxic, and high-temperature resistance. Strong pressure resistance, can withstand heavy pressure. The bottom has a non-slip pattern to prevent slipping. There are handles on both sides for easy handling. The lockable lid can protect the contents of the box. Space-saving: Easy to fold and open. It is only 2.4 inches high after full folding and does not occupy more space. The box capacity is 30L or 50L, which can store the small items in your trunk neatly. Application: It is very suitable for shopping, picnics, camping and other outdoor occasions that need cold drinks and fresh food. Size comparison: 42 x 29 x 24cm L: 53 x 36 x 29cm. L size upgrade with buckle, storage more assured. If you have any questions, please contact us, we will reply to you within 24 hours.