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The short answer
Bose SoundLink Flex Portable Speaker (2nd Gen) wins this comparison. Choose it if you want less weight in your bag. Bose SoundLink Flex Portable Speaker (2nd Gen) weighs 1.3 lb versus 6.17 lb — 4.87 lb less to carry. Its recorded reference price is $230.99 lower.
Bose
A compact speaker that floats and adjusts its sound when you change its position. IP67 protection and a built-in microphone suit outdoor listening and hands-free calls.
Bettr Score
82/100
Marshall
Long weekends between charges are its main draw: 50+ hours of playtime, plus phone charging. Bass and treble knobs give hands-on control, though the 6.17 lb body is substantial.
Bettr Score
58.8/100
| Bose SoundLink Flex Portable Speaker (2nd Gen) | Specification | Marshall Kilburn III |
|---|---|---|
$149 ✓ Winner | Reference price | $379.99 |
12 hours | Advertised battery life | 50 hours ✓ Winner |
1.3 lb ✓ Winner | Weight | 6.17 lb |
IP67 | Ingress protectionPersonal preference | IP54 |
4 ✓ Winner | Durability tier | 2 |
5.3 | Bluetooth versionTie | 5.3 |
No | Can charge another device | Yes ✓ Winner |
No | USB audio inputTie | No |
No | Auracast or compatible broadcast pairing | Yes ✓ Winner |
Yes ✓ Winner | Floats in water | No |
Yes ✓ Winner | Speakerphone | No |
The buying advice
Choose Bose SoundLink Flex Portable Speaker (2nd Gen) if you want less weight in your bag. Bose SoundLink Flex Portable Speaker (2nd Gen) weighs 1.3 lb versus 6.17 lb — 4.87 lb less to carry.
Choose Marshall Kilburn III if a longer advertised playtime matters. Marshall Kilburn III advertises up to 50 hours, versus up to 12 hours for Bose SoundLink Flex Portable Speaker (2nd Gen).
Bose SoundLink Flex Portable Speaker (2nd Gen) weighs 1.3 lb versus 6.17 lb — 4.87 lb less to carry. Marshall Kilburn III advertises up to 50 hours, versus up to 12 hours for Bose SoundLink Flex Portable Speaker (2nd Gen). The recorded reference-price difference is $230.99.
Bose SoundLink Flex Portable Speaker (2nd Gen) weighs 1.3 lb versus 6.17 lb — 4.87 lb less to carry.
Marshall Kilburn III advertises up to 50 hours, versus up to 12 hours for Bose SoundLink Flex Portable Speaker (2nd Gen).
Marshall Kilburn III can charge another device from its battery; the other speaker’s verified specification says it cannot. Charging a phone uses some of the speaker’s battery.
Bose SoundLink Flex Portable Speaker (2nd Gen) is specified to float; the other speaker is specified not to. Follow the manufacturer’s water-use instructions.
People's Pick
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eBay — New
In stock · checked Oct 30, 2026
Price needs rechecking. Confirm at the retailer.
$94.99
Item price · shipping unknown
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eBay — New
In stock · checked Oct 30, 2026
Price needs rechecking. Confirm at the retailer.
$349.99
Item + shipping · before tax
$349.99 + $0.00 shipping
We may earn a commission when you buy through links marked “Affiliate link.” This does not change your price or our scores. How we earn
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