A collection of items you may normally carry on your person, without which life could be much more difficult. Things like: wallet, phone, keys, wristwatch, flashlight, USB flash drive, sunglasses, etc.
Additionally, there are things you may also want to have nearby in case of an event causing the need to get away quickly. Things like: a lighter, multi-tool, phone charger, compass, steel water bottle, mini first aid kit, protein bars, feminine hygiene, personal Rx meds.
Collect as many of these as possible to add to your EDC Backpack.