Packaging system

A packaging system comprising:

• a) a primary storage container having a body portion of a first volume, a neck portion extending from the body portion, the neck portion providing an outlet of the primary storage container, an annular fitting on the neck portion for fitting a closure onto the primary storage container and at least one cutting element extending outwardly of the fitting in a direction away from the outlet;
• and
• b) a secondary refill container having a chamber portion, having a second volume smaller than the first volume, filled with a dose of a refill composition, the chamber portion having an annular flange defining an opening of the chamber portion, and a frangible film covering the opening and attached to the annular flange,
• wherein the fitting and the flange have complementary respective first and second bayonet couplings which are adapted releasably to lock the flange into the fitting to fit the secondary refill container over the outlet of the primary storage container, and the at least one cutting element is located to cut the frangible film when the first and second bayonet couplings are coupled together.