Lothran doesn´t carry anything specific with him other than his Dark Dagger of course, or Snowflake when he stays in Bruma which he does every winter. Prior to that he stays a month or two in the Imperial City, to prepare for the journey north.
Other than that he carries a limited amount of arrows when using a bow (max 20) and as he hated the plus sign in the center of his vision I had to remove that

A few years ago something interesting happened in Anvil. Suddenly he was fed up carrying around all the town guide books, 400 lockpicks, 10 torches etc so he decided to drop it all in a crate for anyone to take. He also sold and re-bought an expensive item to get rid of too much gold at Morvayn´s. Nowadays he travels much lighter and couldn´t be happier

I may have forgotten a thing or two...