In both form and function, the Logitech MX Anywhere 2S succeeds as one of the best travel companion mice out there. It's a bit pricey, so certainly not for everyone, as plenty can make do with a simple $20 to $30 alternative like the Logitech Wireless Mouse M320 , but the cost comes with perks.
Super-portable design; Tracks on virtually any surface, including glass; Robust customization software with useful Flow continuity feature; Long battery life; Works with Windows or Mac
Might be too small for some users; Somewhat pricey