The Seven Advanced CHALLENGE BOY Backpack is equipped with WIRELESS SPEAKER to listen to your favorite playlist together with your friends whenever you want. You have just to plug in your smartphone. Well-finished in every smallest details, it is comfortable to wear on the shoulders thanks to the preformed Ergosystem backrest and the padded and breathable shoulder straps. Moreover, thanks to the integrated bottom, even when fully loaded, the structure of the backpack remains unchanged, guaranteeing the stability of the content. In its large and spacious double compartment there is plenty of room for everything you need, even for your notebook and your water bottle, also being able to count on its numerous and practical pockets.