I have received 5 emails asking what is that on my left shoulder strap. It is a rescue tool with a knife blade, glass punch, seat belt cutter. I attached it via a few zip tied behind the case to the harness.

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A spring loaded steel tip window punch
440C stainless steel hook blade for seatbelt cutting
LED light with replaceable batteries
1/2 serrated 440C stainless steel blade
Stainless steel belt clip & heavy duty nylon belt sheath