[INSULATED and LEAKPROOF COOLER FUNTION] Lunch backpack have an insulation compartment in the front pocket, not only keeps the food warm but also keeps cold juice or drinks for about 3-5 hours, allow you to enjoy delicious food at any time. Food container compartment dimension: 11.4*8*5.6 inch[SMART DESIGN] When you store food or fruit on lunch bag compartment, lunch backpack main compartment area will be reduced to provide more space for food container compartment. When you don't need to carry food, the insulated layer can be folded so that you can carry more items in main pocket. A combination of lunch bag and laptop backpack[LARGE CAPACITY] The front accessories pocket can attach many things such as telephone,pens,wallet,keys,charger and so on. Largest main compartment hold for 2-3 days travel clothing, also hold accessories,notebook, personal toiletries, dimensions: 11.8" x 6.70" x 17.1" ( 30 x 17 x 43.5 CM). The second large compartments can hold your 15.6 inches laptop,books and so on[USB CHARGING LAPTOP BACKPACK] External USB port provides a convenient charging of your electronics whenever and wherever they are power off.Build-in charging cable provides a convenient charging of your electronic device anywhere.Back tie straps lets the backpack easily lift and carry when travelling with the luggage