Efficient insulation technology Waterresistant fabric blocks heat and a doublelayer foil lid enhances thermal retention. This design helps keep beverages cold up to 8 hours and meals fresh for 4 hours during extended use. Enhanced packing solution 50L main compartment provides ample space for bulky items, supported by front double pockets and elastic mesh. The layout promotes tidy, accessible storage for every item you carry. Leakproof design Reinforced seams and a fully waterproof lining protect against spills. This insulated backpack offers reliable performance when transporting liquids such as soups or drinks. Enhanced support system Wide, padded shoulder straps combined with honeycomb back cushioning reduce pressure and improve comfort for long hours of carrying. Key specifications Capacity: 50L main compartment Materials: waterresistant fabric Insulation: doublelayer foil lid Temperature retention: beverages cold up to 8 hours; meals fresh up to 4 hours Lining: fully waterproof Seams: reinforced for leak resistance Pockets: front double pockets and elastic mesh Comfort features: wide padded shoulder straps; honeycomb back cushioning Use scenarios Day trip or picnic: Transport drinks and meals with reliable insulation to keep items cold and fresh during outdoor activities. Workday or school: Large main compartment accommodates meals and beverages, while front pockets and elastic mesh keep utensils and small items organized and easily accessible. Road trip or camping: Leakproof design protects against spills when carrying soups or drinks, with a comfortfocused harness for extended wear.