Unzipping a pocket may use up what little time you have to react.
That's not a problem with this piece of gear. It's designed to open without having to pull on a zipper to open it. The guys who designed it are up to speed on what works with personal defense and they designed it with that in mind.
I have a safepacker too but I prefer the kit bag for quick access. Thing is, even without a pistol it's a good piece of gear for anything you want to have readily accessible like a camera, binos, headlamp, snacks, etc.
Shooting a rifle with it on is not a problem either.
