Secondly, we want to cover some mid-sized speakers that will slot in a bag or backpack. We contemplate these transportable. When I say in the bag, I don’t suggest filling up the total volume of your backpack, either. Having said that, Tribit finds an answer towards the sound situation https://www.bluetoothspeaker.top/new-model-cool-subwoofer-wireless-speaker-inalambrico-bluetooth-speaker/