This battery-powered Bluetooth speaker fits in a hand, is waterproof and goes just about anywhere. The speaker weighs less than a pound and easily fits in a backpack, yet it produces high-quality audio. It supports AirPlay 2 for Apple devices (as well as Wi-Fi and Bluetooth for connectivity to your other equipment) and can last up to 10 hours per charge. When you pair two Sonos Roam speakers together wirelessly, you can get true stereo sound.
$179; https://www.sonos.com/
