From the site info:
Everyday Carry, or EDC, generally refers to small items or gadgets worn, carried, or made available in pockets, holsters, or bags on a daily basis to manage common tasks or for use in unexpected situations or emergencies. In a broader sense, it is a lifestyle, discipline, or philosophy of preparedness.
If you can’t get to the site that will be because it is on Tumblr…just sayin’ they’ve been having problems.