This is Russian vest 6B43 with front mag parts, knife in upper part and personal backpack on back. Used by Russian Armed forces today.
Installation:
Grand Theft Auto V>mods>update>x64>dlcpacks>mpsmuggler>dlc.rpf>x64>models>cdimages>mpsmuggler_male.rpf>m_pm_freemode_01_mp_m_smuggler_01
or mpjanuary2016 if you prefer it
Credits:
Model by UZHS#0359
Textures by Papadubi#1329