If you take the “everyday carry” term literally, they are the items that you carry every day wherever you go. And this is usually placed in the bag. These are the things that you tap the pockets for before you go out of the door, the ones you feel lacking or empty without it.
They are certainly valuable not just in a sentimental or monetary way, but they are items that you find essential that you almost cannot live without. And you will learn more about what this means as you browse through this website recommending you of the things that belong within everyday carry.