This lunch bag measures 17" x 13" x 2.75" and not only keeps your 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 in this college school bookbag, which makes it easy to clean and store food. CONVENIENT USB PORT: USB charging part makes it easy to charge your phone while you're walking. 

BATTERY POWER PACK INCLUDED and already installed for you to be able to charge your phone on the go. Two side pockets and thick shoulder strap design for long time wearing will not feel tired.