Adult backpack.MATERIAL & SOLID: Heavy duty XL backpack made from high quality polyester nylon fabric, with heavy-duty two-way waterproof zippers across the backpack are convenient to operate on whichever side you prefer, for a secure and long-lasting usage everyday/weekend. A rugged handle with steel cable on the top for easy carrying, Side compression straps keep the versatile stylish backpack at whatever size you requires INSULATED & LEAKPROOF COOLER FUNTIONOur Lunch Backpack not only keeps the food warm but also keeps cold drinks for about 2-4 hours. The high quality insulation layer of lunch box compartment keeps the food fresh and warm, which makes it easy to clean and store food. Travel backpack cooler bag is suitable for college,office,picnic,beach,trip,travel,outdoor & indoor. Dimension of the cooler compartment: 11.8 x 7.8 x 7.8 inch TSA approved & RFID ANTI-THEFT: Unfolds the extra large backpack freely 90-180 degree making you quickly through the airport security and kee