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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 2.65 lb — 1.35 lb less to carry. Its recorded reference price is $60.99 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
Sony
Press the ULT button for a bass boost, then carry it by the included shoulder strap. IP67 protection, phone charging and up to 24 hours of playtime suit days out.
Bettr Score
68.8/100
| Bose SoundLink Flex Portable Speaker (2nd Gen) | Specification | Sony ULT FIELD 3 |
|---|---|---|
$149 ✓ Winner | Reference price | $209.99 |
12 hours | Advertised battery life | 24 hours ✓ Winner |
1.3 lb ✓ Winner | Weight | 2.65 lb |
IP67 | Ingress protectionTie | IP67 |
4 | Durability tierTie | 4 |
5.3 | Bluetooth versionPersonal preference | 5.2 |
No | Can charge another device | Yes ✓ Winner |
No | USB audio inputNot enough data | Not stated / not applicable |
No | Auracast or compatible broadcast pairingNot enough data | Not stated / not applicable |
Yes | Floats in waterNot enough data | Not stated / not applicable |
Yes | SpeakerphoneTie | Yes |
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 2.65 lb — 1.35 lb less to carry.
Choose Sony ULT FIELD 3 if a longer advertised playtime matters. Sony ULT FIELD 3 advertises up to 24 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 2.65 lb — 1.35 lb less to carry. Sony ULT FIELD 3 advertises up to 24 hours, versus up to 12 hours for Bose SoundLink Flex Portable Speaker (2nd Gen). The recorded reference-price difference is $60.99.
Bose SoundLink Flex Portable Speaker (2nd Gen) weighs 1.3 lb versus 2.65 lb — 1.35 lb less to carry.
Sony ULT FIELD 3 advertises up to 24 hours, versus up to 12 hours for Bose SoundLink Flex Portable Speaker (2nd Gen).
Sony ULT FIELD 3 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) has the lower recorded reference price: $149.00 versus $209.99, a $60.99 difference.
People's Pick
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eBay — New
In stock · checked Oct 30, 2026
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$94.99
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eBay — New
In stock · checked Oct 30, 2026
Price needs rechecking. Confirm at the retailer.
$100.00
Item price · shipping unknown
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