These sit in different size classes, so this is not a straight ranking comparison. The Bose Soundlink Flex ranks #38 of 179 medium speakers by sound quality at $79.99; the Zealot S67 ranks #118 of 120 large speakers by sound quality at $70.94.
The Bose Soundlink Flex is the lighter pick. 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 much less than the Zealot S67 at 5.3 lbs (2.4 kg). It links with other speakers (Bose Party mode), which the Zealot S67 cannot. Watch for: Warm sounding with overly boosted bass which drowns out midrange detail.
The Zealot S67 is the longer-running option. A budget waterproof speaker with a long rated battery, USB-C charging, microSD playback, and stereo pairing. It is rated for 20 hours of battery against 12 for the Bose Soundlink Flex. It keeps a wired aux input, which the Bose Soundlink Flex lacks. It plays in stereo from a single unit, unlike the Bose Soundlink Flex. The catch: Sound quality is the catch.
Buy the Bose Soundlink Flex at $79.99 if you want a medium speaker. Buy the Zealot S67 at $70.94 if you want a large speaker instead.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
Prices on this page were last checked November 11, 2026 at 3:26 AM 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 | Zealot S67 | |
|---|---|---|
| Price | $79.99 | $70.94 |
| Ranked | #38 of 179 in Medium Size Portable Bluetooth Speakers | #118 of 120 in Large Size Portable Bluetooth Speakers |
| App | Yes | No |
| Bass Extension (-10dB) | 56Hz | - |
| Battery Life | 12 hours (Manufacturer specified) | 20 hours (Manufacturer specified) |
| Built-in Microphone | Yes | Yes |
| EQ | No | No |
| IP Rating | IP67 | IPX6 |
| Bluetooth Latency | 33ms | - |
| Maximum SPL | 96dB (measured by Alan Ross Reviews) | - |
| Party Mode | Yes (Bose Party mode) | No |
| Power Input | USB-C | USB-C |
| Stereo | No | Yes |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| Weight | 1.3 lbs (589 g) | 5.3 lbs (2.4 kg) |
| Bluetooth | Yes | Yes |
| Bluetooth Version | 4.2 | 5.2 |
| Dimensions | 7.9” x 3.5” x 2” (201 x 90 x 52 mm) | 11.6” x 4.8” x 5.2” (294 x 122 x 132 mm) |
| Drivers | 1x 60mm full-range driver + 2x passive radiators | 60W: Dual drivers + passive radiator |
| Digital Aux Input | No | No |
| Bluetooth Codecs | SBC | SBC |
| Aux Input | No | Yes |
| Strap | Yes (built-in loop) | - |
| MicroSD Playback | - | Yes |
| Power Bank | - | No |
| Amplifier Power | - | 60W |
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