Royal Robbins (a noted mountain climber) manufactures outdoor clothing under his name as a brand. He developed the 5.11 series (named for a difficulty rating of a climb) for mountain climbing. They were adapted & modified into the 5.11 Tactical clothing, & eventually spun off into a separate company.

The "tactical strap" over the right rear pocket on the 5.11 pants & shorts touted as good for holding a baton or long flashlight, or covering the bottom of a holster, was originally intended as a small gear rack to clip in carabiners & related equipment.

HTH.

David