The UE Wonderboom 2 as well as the UE Boom three are quite portable and durable. The Wonderboom is slightly much more portable than the other two, weighing in at 15 ounces and boasting IPX7 waterproofness. Its short and stout shape also assists it disappear inside of the backpack. https://www.bluetoothspeaker.top/rgb-outdoor-wireless-speaker-with-bluetooth-aux-powered-by-battery/