A container assembly and a method of constructing such an assembly has an outer container (1) a side wall (3) of which forms an open top, and has a blow moulded inner container (7) which forms a liner to the container (1). The liner (7) has a neck (8) which is secured to an internal flnage (4) extending from the outer container. The flange (4) may be moulded integral with either the lener (7) or the outer container (1). A lid (10) has and external annular recess (12) which snap engages with an annular rib (5) on the flange (4) to form a sealed chamber in the assembly. The lid (10) and liner (7) are formed of the same first plastic material (for example PET) while the outer container (1) is formed of a different second plastics material (for example, polypropylene) so that the sealed chamber is defined wholly by the first plastics material which may be expensive but resistance to corrosion from contents (such as paint) stroed in the chamber while the second plastics of the outer container may be inexpensive but non-resistant to corrosion from the contents in the chamber.