Lou, check this one out, should fit the TX 500, plus mic and cables, maybe a battery pack,? but not sure. Was looking at it a few days ago. For the minimalist. Away from home, will look at the measurements of the Tx 500. Just thought I would share, please research as I dont have one.?
73's Roy.
https://www.amazon.ca/Jueachy-Multifunctional-Motorcycling-Traveling-Detachable/dp/B0797NLGG7/ref=mp_s_a_1_9?crid=3GM6WN399TZ0L&keywords=SHANGRI-LA+Tactical+Waist+Pack+Bag&qid=1647258923&sprefix=shangri-la+tactical+waist+pack+bag%2Caps%2C155&sr=8-9#
Roy Ramdeen