One of the handiest things you can “every day carry” is a pocket flashlight. You need it to be easy to slip into a pocket, bright enough to properly light your way through the darkness, and have it use easy to find batteries when replacement is called for, to wit: AA types.
One item that certainly fits the bill is the Tactical 5.11 Unisex TMT PLx Penlight.
90 Lumens, runs for 4 hours on 2 AA batteries. Be bright, bachelor, buy this one today.