Function travel backpack with speakers and 2000mAh charger bank. This ultra-light and durable daypack is composed of water-repellent ripstop fabric and is insulated for additional resistance. Hiking with a waterproof bag and enjoying music at the same time, you will never feel bored. Support solar powered and USB powered. Perfect for hiking, camping, and outdoor use. 20 1/2″ L x 13 3/4″ W x 8 5/8″ H