The Sonos Move 2 is a little big and bulky, but if portability is second to sound for you, it's an excellent option.
The Sonos Move is the company's first portable speaker, costs $399
Sonos Move 2 Review
Sonos Move 2 review: moving portable sound up a gear
Super-premium Sonos Move 2 speaker leaks out in full with insane battery life and more - PhoneArena
Sonos Move review: A big speaker with a big sound - BBC Science Focus Magazine
Sonos Move 2 Review: Two Key Improvements Make for a Better Speaker - CNET
Sonos Move 2 Review: Premium Portability Perfected?
Sonos Move 2 review: Big and bulky, with excellent sound
Sonos Move 2 Review: Premium Portability Perfected?