JBL Go 4 - Ultra-Portable, Waterproof and Dustproof Bluetooth Speaker, Big JBL Pro Sound with Punchy bass, 7-Hour Built-in Battery, Made in Part with Recycled Materials (White)

For those seeking a compact speaker, this fits the bill with big sound. It boasts up to 7 hours of playtime and is waterproof. With high demand and a price about 20% below list, it's a good time to buy. Given its capabilities and price, it's a strong consideration.