A vial for use with a capillary electrophoresis, CE, instrument having a sampling capillary and an electrode, the distal ends of which are configured for immersion within a sample contained with the vial, the vial comprising: a first body extending from a superior end to an inferior end along a longitudinal axis, an external surface of the first body having a circular cross-sectional shape substantially along its entire length from the superior end to the inferior end, an inner wall of the first body defining a first fluid chamber extending from the superior end for containing the sample; characterized in that: a second body is coupled to the first body; an external surface of the second body has a circular cross-sectional shape substantially along its entire length from a superior end to an inferior end; an inner wall of the second body defines a second fluid chamber extending from the superior end for containing a second sample; the first and second fluid chambers are not fluidly coupled; a cross-sectional shape of the first fluid chamber in at least one plane orthogonal to the longitudinal axis of the first body exhibits at most two axes of symmetry; and a cross-sectional shape of the second fluid chamber of the second body in at least one plane orthogonal to the longitudinal axis of the second body exhibits at most two axes of symmetry. a first body extending from a superior end to an inferior end along a longitudinal axis, an external surface of the first body having a circular cross-sectional shape substantially along its entire length from the superior end to the inferior end, an inner wall of the first body defining a first fluid chamber extending from the superior end for containing the sample; characterized in that: a second body is coupled to the first body; an external surface of the second body has a circular cross-sectional shape substantially along its entire length from a superior end to an inferior end; an inner wall of the second body defines a second fluid chamber extending from the superior end for containing a second sample; the first and second fluid chambers are not fluidly coupled; a cross-sectional shape of the first fluid chamber in at least one plane orthogonal to the longitudinal axis of the first body exhibits at most two axes of symmetry; and a cross-sectional shape of the second fluid chamber of the second body in at least one plane orthogonal to the longitudinal axis of the second body exhibits at most two axes of symmetry. a second body is coupled to the first body; an external surface of the second body has a circular cross-sectional shape substantially along its entire length from a superior end to an inferior end; an inner wall of the second body defines a second fluid chamber extending from the superior end for containing a second sample; the first and second fluid chambers are not fluidly coupled; a cross-sectional shape of the first fluid chamber in at least one plane orthogonal to the longitudinal axis of the first body exhibits at most two axes of symmetry; and a cross-sectional shape of the second fluid chamber of the second body in at least one plane orthogonal to the longitudinal axis of the second body exhibits at most two axes of symmetry.