I have a lot of friends who make being prepared a priority in their life. Part of the mentality is having a set number of items a person carries on their person everyday. This is frequently referred to as Every Day Carry, or EDC.
A person's EDC list likely includes things you normally carry as well. An ID. Some money. A bank card. A phone. It's pretty common for most people I know to carry all of those things. But some of the more prepared may add other things to that. A bandana, flashlight, knife and multitool make my list. If you see me, I have at least those things on me. I find I use the knife, flashlight and multitool almost every day.
Many people I know add a firearm to their EDC list. Depending on who you are, I think that's a rational choice. But there is one thing that a person may find more useful more often, and that's a first aid kit. Just look to the bombing in Boston- a first aid kit and the training to use it could have helped people. A gun would have been a liability as the police and military cracked down. I'm not saying a person shouldn't carry a gun, only that if you do, it makes sense to carry a first aid kit as well. And if you don't, it still makes sense to add a first aid kit to your EDC. Many people I know carry a quality first aid kit in a bag, perhaps a backpack, purse or satchel. If you want to be prepared it seems like a reasonable inconvenience.