Best Portable monitors for graphic design

Hi all, I’m a graphic designer and I need to buy a portable monitor to hook up to my mac book pro so that I can work remotely. Has anyone found a good reasonably priced option? I figure it needs to be as large as possible for design work, so 17" probably best. Any thoughts would be very welcome.
Thanks Chris

Define portable.
I would go for the largest possible display with the best color accuracy and hardware calibration in a wide gamut like Adobe RGB if you do print design. For web design most 99% sRGB displays could be OK.

Asus ProArt PQ22UC is one of best portable graphic design monitors out there.