Although its battery life remains a weak point and its price has gone up a bit, the second-generation Flip is an improvement over the original and one of the best mini portable Bluetooth speakers currently available.
Anker Soundcore Motion Boom Plus Outdoor Speaker with 80W Booming Sound, 20H Playtime, IP67 Waterproof and Dustproof, Type-C, Custom EQ, Bluetooth 5.3, Portable Bluetooth Speaker For Outdoors, Camping : Electronics
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Tribit StormBox Micro 2 Portable Speaker: 90dB Loud Sound Deep Bass IP67 Waterproof Small Speaker Built-in Strap, 12H Long Battery Powerbank for Outdoor Camping Biking, 120ft Range (Pure Blue) : Electronics