Short answer: the Bose Soundlink Flex. It ranks #38 of 177 medium speakers by sound quality, rated 3.8/5, at $79.99. The Bogasing M5 ranks #61, rated 3.5/5, at $52.99, $27 cheaper, not enough of a saving to outweigh the sound-quality gap.
The Bose Soundlink Flex is the lighter option. A small, rugged waterproof speaker that survives drops and floats, with a warm, bass forward sound for casual outdoor use. At 1.3 lbs (589 g) it weighs noticeably less than the Bogasing M5 at 1.7 lbs (757 g). Watch for: Warm sounding with overly boosted bass which drowns out midrange detail.
The Bogasing M5 is the longer-running pick. A compact, backpack friendly speaker with very long battery life and USB-C charging at a budget price. It is rated for 30 hours of battery against 12 for the Bose Soundlink Flex. It keeps a wired aux input, which the Bose Soundlink Flex lacks. It has an adjustable EQ, which the Bose Soundlink Flex lacks. The catch: Front/rear driver configuration.
Buy the Bose Soundlink Flex. It is rated higher for sound quality, and saving $27 with the Bogasing M5 does not make up for the sound-quality gap.
Want more options? Browse the full Portable Bluetooth rankings.
A small, rugged waterproof speaker that survives drops and floats, with a warm, bass forward sound for casual outdoor use.
A compact, backpack friendly speaker with very long battery life and USB-C charging at a budget price.
Prices on this page were last checked October 31, 2026 at 7:11 PM UTC. Product prices and availability are accurate as of that date/time and are subject to change; the price and availability shown on Amazon at the time of purchase will apply to the purchase of this product.
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Specifications Side By Side
| Bose Soundlink Flex | Bogasing M5 | |
|---|---|---|
| Price | $79.99 | $52.99 |
| Ranked | #38 of 177 in Medium Size Portable Bluetooth Speakers | #61 of 177 in Medium Size Portable Bluetooth Speakers |
| App | Yes | No |
| Bass Extension (-10dB) | 56Hz | 61Hz |
| Battery Life | 12 hours (Manufacturer specified) | 30 hours (Manufacturer specified) |
| Built-in Microphone | Yes | - |
| EQ | No | Yes |
| IP Rating | IP67 | IPX7 |
| Bluetooth Latency | 33ms | - |
| Maximum SPL | 96dB (measured by Alan Ross Reviews) | 96dB (measured by Alan Ross Reviews) |
| Party Mode | Yes (Bose Party mode) | - |
| Power Input | USB-C | USB-C |
| Stereo | No | No (front/rear drivers) |
| Omnidirectional | No | Yes |
| TWS | Yes | Yes |
| Weight | 1.3 lbs (589 g) | 1.7 lbs (757 g) |
| Bluetooth | Yes | Yes |
| Bluetooth Version | 4.2 | 5.3 |
| Dimensions | 7.9” x 3.5” x 2” (201 x 90 x 52 mm) | 6.3” x 3” x 2.8” (160 x 76 x 71 mm) |
| Drivers | 1x 60mm full-range driver + 2x passive radiators | 30W system |
| Digital Aux Input | No | No |
| Bluetooth Codecs | SBC | SBC (inferred; additional codecs unverified) |
| Aux Input | No | Yes |
| Strap | Yes (built-in loop) | - |
| MicroSD Playback | - | Yes |
| Power Bank | - | Yes (USB-A) |
| USB Playback | - | Yes |
| Frequency Response | - | 50Hz - 20kHz (Manufacturer specified) |
| Amplifier Power | - | 40W |
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