JBL Go 3: Portable Speaker with Bluetooth, Built-in Battery, Waterproof and Dustproof The dust-proof, waterproof JBL Go 3: Portable Speaker ($40) can fit into your pocket or as a keychain on any bike, backpack, or water bottle. Even though it's tiny, it packs a powerful sound with punchy deep bass. Image Source: amazon.com JBL Go 3: Portable Speaker $40 from amazon.com Buy Now