aluminum film insulation: The inner tank uses reflective aluminum film to reduce infrared heat transfer, providing thermal insulation while being waterproof and moistureproof. It is easy to care for, built as a multilayer composite, and maintains temperature for longer. Two aluminum film options are available. Aluminum alloy picnic basket model: Built with a oxford cloth exterior that is waterproof and moistureproof, and a comfortable fabric interior. Features a classic striped plaid color design and a durable aluminum alloy frame with a solemn, sturdy appearance. 30L large capacity supports multiperson use and enhances security during travel and picnics. Insulated picnic bag cloth options: Three style choices available (small flying leaves, red and white grid, yellow and white grid). Multilayer insulation includes aluminum film, nonwoven fabric, pearl cotton, and oxford cloth. Equipped with a double zipper for smooth operation, thick aluminum membrane, and waterproof and antifouling properties. Material weight is 140 g. Practical benefits you can count on: Keeps food and drinks at the right temperature for extended periods, protects contents from moisture and stains, and supports easy care and cleaning. The sturdy frame and durable materials provide reliable use for outdoor events. Use scenarios: Park or beach picnic with family or friends, using the 30L basket for food, beverages, and utensils while maintaining temperature. Day trips or road outings where a secure, durable container is preferred for carrying meals and snacks. Quick outdoor events or gatherings where an easy to open, doublezip insulated bag helps keep items organized and fresh.