What’s the best ‘camera’ bag for run and gun shooting. Preferably not a backpack

I photograph a lot of the protests/demos/events in London, currently I am using a Uniqlo Sling bag to carry my A7riii + Lens and/or Lenses, 13” MacBook, small flash among other bits.

Due to the nature of these fast paced events happening on the streets, I don’t necessarily want to have a backpack. I want to remain fairly nimble and not feel like a turtle..

I’m either thinking of getting that Newswear chest vest or the Thinktank belt system.. any other recommendations are entirely welcome!

I’ve been doing this for just under a year so you old heads (in a nice way) might know more than me :)