I have a huge turn-out bag for my entry team stuff, it was a Galls bag (not my idea but that's what they got). It has my ballistic helmet, goggles, CJAZ raid armor, chin/knee guards, elbow pads, tac-rig with Mdl6004 drop-leg and hip rig for AR mags, Cold Steel Recon Tanto (for some up-close 'hows-your-father'), hydration pack, a couple of LED flashlights, batteries galore, gas mask, a change of clothes, and some energy bars.
Soon to be added: maps and evacuation layouts for local buildings particularly schools, a medical kit, night vision monocular, a lock-pick set... I don't think you ever run out of things that would come in handy.
I do have a question, anyone know of a good field med-kit available for one-shot purchase? I have first responder training so I just need bandages, antiseptic, quick-clot etc. I am not a medic and we may not be able to implement a team medic anytime soon (not officially anyway). I'm looking for something small enough to fit in a large utility pouch, vest or belt mounted.