Packaging kit and refill container

A consumer product packaging kit comprising a closure (1), an outer container (2) and an inner container (3) capable of releasably engaging with and inside of the outer container (2), wherein:

• A) the outer container (2) comprises:
• a) an open mouth (21) at the top of the outer container (2),
• b) a shoulder (22) extending outwardly from a lower portion of the open mouth,
• c) a body (23),
• d) an open base (24) at the bottom of the outer container (2),
• e) said open mouth including, at a level above the shoulder, a container coupler for securing a closure
• f) an annular extension (26) longitudinally, vertically offset from the open mouth (21) and at a level below the shoulder (22), and
• g) an engagement structure (27);
• and
• B) the inner container (3) for containing consumer product comprises:
• (i) an open top end (31) releasably engaging with the annular extension (26) to secure the inner container (3) to the outer container (2) when the inner container (3) is in a fully engaged position,
• (ii) a side wall (32),
• (iii) a closed bottom end (33), and
• (iv) an engagement coupler (34) cooperating with the engagement structure (27) to secure the inner container (3) to the body (23) of the outer container (2) when the inner container (3) is in a fully engaged position, wherein the engagement structure (27) is in a lower portion of the body (23) and the engagement coupler (34) is in a lower portion of the side wall (32), wherein the engagement structure (27) cooperates with the engagement coupler (34) by shape-locking or by a threaded connection to bring the inner container into the fully engaged position and wherein an outer diameter of the annular extension (26) is equal to an inner diameter of the open top end (31).