Spinal jack protector (don't want a third GiTS)
insulant shoes, in case it's raining and a neon sign falls or a jackass is running around with a handheld tesla coil
any HUD (glasses, visors, cybernetic eyes). Nobody got time to check mags.
Concealed carry holsters for the heat you are packing. Shotguns and "special" weapons probably exempt.
At least two pairs of latex gloves, megacorps get nosy.
If you still need to eat, don't forget MREs. If you still have a tongue you can opt for beans or other non-perishables.
Bulletproof storage system. You never know when you need to store your last moments, your important passwords and credentials, or your AI GF.