I haven't seen this here, or at least I couldn't find it on initial search, maybe because it's hard to be aware of the bag's existence as it was never used by any NPC in game (probably a remnant from a time when CDPR was considering a 3rd person view). 

*As this was meant to be used by Johnny in game, it's unfortunately available for Male V only.

Affects all the harness Vest_10 and also the Techie_01_Set_Vest.

I believe the recolors will affect what the bag looks in game during the first Johnny mission, Love Like Fire (haven't tried it yet).

Install by dropping in the game's archive folder.

Thanks to all the developers of Wolvenkit!