a housing defining a chamber within which a supply of chalk can be stored;

a reel within the chamber and mounted for rotation relative to the housing around a first axis,

the housing having an opening through which a flexible line emanating from the reel can extend to outwardly of the housing for use,

the chamber having a “V” shape with the opening at the bottom of the “V”,

the chamber having a first subchamber with a first volume for chalk between the first axis and fill opening and a second subchamber, diametrically oppositely located relative to the first subchamber, with a second volume for chalk that is greater than the first volume,

the housing comprising a front wall, a rear wall, and a peripheral wall portion that surrounds the chamber between the front and rear walls; and

a fill opening formed through the peripheral wall portion and in communication with the chamber,

the fill opening located on the peripheral wall portion at a location between the first axis and the housing opening,

the housing configured to be placed stably on a flat horizontal support surface in a fill orientation wherein chalk can be introduced through the fill opening so as to progressively fill both the first and second subchambers at the same time,

wherein the chamber has a chalk volume capacity and with the chalk line apparatus in the fill orientation upon a horizontal support surface, substantially the entire chalk volume capacity can be filled with chalk without spillage of chalk out of the chamber through the fill opening.