The UE Wonderboom two as well as the UE Boom 3 are quite portable and durable. The Wonderboom is slightly extra portable than the other two, weighing in at fifteen ounces and boasting IPX7 waterproofness. Its quick and stout shape also will help it disappear inside of the backpack. https://www.bluetoothspeaker.top/bluetooth-stereo-surround-subwoofer-speakers-audio-player-loudspeaker/