Method of packaging a two component composition into a dual vial

A method of packaging a two component composition into a dual vial, wherein the dual vial comprises a single continuous piece of material arranged to provide both a first vial and a second vial, the method comprising:

• providing a second component of the composition into a volume, of the second vial, surrounding the first vial;
• providing a first component of the composition into the first vial, wherein a wall of the first vial is provided by a first part of the single continuous piece of material and a wall of the second vial is provided by a second part of the single continuous piece of material separate from the first part;
• wherein the first part is disposed in and surrounded by the second part;
• wherein the wall of the first vial is connected to the wall of the second vial second vial at a transition zone wherein, at the transition zone, the first vial has a diameter substantially equal to a diameter of the second vial and a break zone in the wall of the first vial is disposed at the transition zone, wherein the first vial is frangible from the second vial at the break zone, thereby to open the first vial into the second vial without breaking the second vial;
• the method further comprising closing the first vial and the second vial.