The UE Wonderboom 2 as well as the UE Boom three are quite portable and durable. The Wonderboom is slightly extra portable than the other two, weighing in at 15 ounces and boasting IPX7 waterproofness. Its quick and stout shape also will help it disappear inside of the backpack. https://www.bluetoothspeaker.top/speaker-bluetooths-wireless-speaker-hifi-subwoofer-bluetooth-speaker/