I have four:
- a minimal "Altoids tin" kit that I first put together for fun, but ended up putting in my briefcase along with a similar "Altoids tin" FAK for EDC;
- a medium-sized kit in a shoulder bag that has enough gear, rations and water for 2-3 days, which along with a couple of military ponchos and poncho liner are always in the trunk of my car;
- a large rucksack with enough gear, supplies and emergency rations to camp out in most conditions for 6-8 days, which currently lives in the back of my closet;
- my brain, which I have stuffed with as much survival-promoting information as I can. I EDC that, too (although my wife and kids don't necessarily agree that I have it with me EVERY day...).

I have a car kit, a small BOB, a medium BOB, and a Large BOB. I also have a drawer filled with spare supplies (used for restocking the BOBs) that I keep a backpack next to.