Ruggedness and waterproof design: We give precedence to speakers that are built to survive the knocks and bumps of travel. We want speakers with an Ingress Security (IP) score, which tells you precisely how dustproof and waterproof a speaker is. All airlines have size and weight limits for objects https://www.bluetoothspeaker.top/hot-selling-new-arrival-usb-player-waterproof-btspeaker-super-quality-wireless-speaker/