Mpow Boombag Portable Water-Resistant Wireless Bluetooth 4.0 Speaker Big performance, small size. You don't have to sacrifice performance for portability. Unique and Stylish Appearance: Water resistant and unique design for outdoor activity. You can just clasp on the backpack and go, go to camping, hiking, and enjoy your music on the travel. Mpow Boombag speaker delivers full, natural sound from an ultra-compact speaker that fits in the palm of your hand. Seamlessly stream and share music, movies, games, phone and conference calls anywhere.