Collapsible containers

A collapsible, thin wall, plastic container comprising a closed end, an annular peripheral side wall, an open upper end defined by the top of said side wall, and a removable cap securable to said open end;

• said annular peripheral side wall having an upper portion adjacent said open upper end, a lower portion adjacent said closed end, and plural intermediate portions between said upper end and said lower end;
• said cap having a top wall, a radially outer depending skirt, a radially inner depending skirt and a sealable chamber defined by said cap top wall and said inner annular skirt extending downwardly from said top wall to an open lower end closed by a removable seal;
• said peripheral side wall varying in diameter from said open end to said closed end and including means for enabling axial collapse of the container to a compact, collapsed condition;
• said means for enabling axial collapse being configured such that a plurality of substantially vertically oriented concentric folds are formed in said plural intermediate portions of said annular peripheral side wall lying radially between remaining uncollapsed upper and lower portions of said annular peripheral side wall when the container is in the collapsed condition, and such that said concentric folds have upper edges substantially level with said cap top wall;
• said radially inner skirt portion having an axial length substantially corresponding to said concentric folds and said uncollapsed upper and lower portions of said annular peripheral side wall such that said radially inner skirt provides axial support for said container in said collapsed condition;
• and said radially outer depending skirt having means to secure said cap to said open upper end.