They used a Ziploc bag to take their keyboard to the beach
This picture doesn’t evoke images of the beach. However, it is a good, inexpensive way to protect speakers and keyboards from wind, sand, and humidity. Wrapping electronic devices in Ziplocs is a simple yet brilliant hack, and simply taping two Ziploc bags together makes an even larger one.
This is also useful when there’s a need to leave something outside for a friend who is unable to pick it up right away. It seems to be weather-resistant, so anything can be stuffed inside these Ziploc bags and set aside on the front porch.