Leather messenger laptop bag that'll fit an RB17?

I recently pre-ordered a Razer Blade 17:

https://www.razer.com/.../Razer-Blade-17/RZ09-0423PEF3-R3U1

and I'm looking for recommendations on a leather messenger laptop bag that'll fit this 0.78" x 10.24" x 15.55" (19.9 mm x 260 mm x 395 mm) laptop. My favorite brand, KNOMO of London, doesn't make a messenger bag wide enough. Their Bungo is called 15.6", but that's (apparently) measured diagonally.

THANKS!

– Dave