Did tonight while out...I generally do when going out at night.
Inside of the offhand front pocket to the outer left corner...Or at the belt offhand just forward of the off hand sidebelt loop.
Surefire E1B 'Backup'
Surefire E1B Backup® LED Flashlight
Image source- SureFire E1B Backup (Black Body) Ultra Compact Dual Output LED Flashlight 80 Max Lumens - Knifecenter.com