Short answer: the Bose Soundlink Flex 2nd gen if sound quality matters most, the Bogasing M5 if price matters most. The Bose Soundlink Flex 2nd gen ranks #37 of 177 medium speakers, rated 3.8/5, at $149. The Bogasing M5 ranks #61, rated 3.5/5, at $52.99, $96.01 cheaper.
The Bose Soundlink Flex 2nd gen is the lighter option. A small, rugged waterproof speaker with clear, well balanced mids, app EQ, aptX Adaptive and stereo pairing with a second unit. At 1.3 lbs (586 g) it weighs noticeably less than the Bogasing M5 at 1.7 lbs (757 g). The catch: One Flex remains mono and cannot deliver genuine low-bass rumble; RTINGS also found the elevated treble can turn hi-hats and other high-frequency detail piercing.
The Bogasing M5 is the longer-running choice. 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 2nd gen. It keeps a wired aux input, which the Bose Soundlink Flex 2nd gen lacks. The tradeoff: Front/rear driver configuration.
Buy the Bose Soundlink Flex 2nd gen when sound quality outweighs the price for you, and the Bogasing M5 when the price outweighs sound quality instead.
Want more options? Browse the full Portable Bluetooth rankings.
A small, rugged waterproof speaker with clear, well balanced mids, app EQ, aptX Adaptive and stereo pairing with a second unit.
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.
As an eBay Partner, we may be compensated if you make a purchase.
Specifications Side By Side
| Bose Soundlink Flex 2nd gen | Bogasing M5 | |
|---|---|---|
| Price | $149.00 | $52.99 |
| Ranked | #37 of 177 in Medium Size Portable Bluetooth Speakers | #61 of 177 in Medium Size Portable Bluetooth Speakers |
| App | Yes | No |
| Battery Life | 12 hours (Manufacturer specified) | 30 hours (Manufacturer specified) |
| Built-in Microphone | Yes | - |
| EQ | Yes (3 band) | Yes |
| IP Rating | IP67 | IPX7 |
| 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 (586 g) | 1.7 lbs (757 g) |
| Bluetooth | Yes | Yes |
| Bluetooth Version | 5.3 | 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) |
| Aux Input | No | Yes |
| Drivers | 60mm full-range driver with passive radiators | 30W system |
| Bluetooth Codecs | SBC, AAC, aptX Adaptive | SBC (inferred; additional codecs unverified) |
| Digital Aux Input | No | No |
| Strap | Yes (built-in loop) | - |
| Bass Extension (-10dB) | - | 61Hz |
| Maximum SPL | - | 96dB (measured by Alan Ross Reviews) |
| MicroSD Playback | - | Yes |
| Power Bank | - | Yes (USB-A) |
| USB Playback | - | Yes |
| Frequency Response | - | 50Hz - 20kHz (Manufacturer specified) |
| Amplifier Power | - | 40W |
Related Speaker Comparisons
How Bose Soundlink Flex 2nd gen compares with other leading options: