Collapsible vessel

A collapsible vessel for carrying liquid comprises four connectable, flexible sheet members. First and second sheets 1, 2 of generally curved trapezoid shape have an aperture 9A, 9B formed at or near three corners and a rivet 12A formed at or near a fourth corner. A third sheet 3 has a rivet 12B formed at or near each end. A fourth sheet has a notch formed in opposing end edges. A fifth elongate sheet 6 may have apertures formed at or near each end to form a handle. Each aperture may be a punched keyhole. The sheets may be stainless steel. Constructing the vessel comprises connecting the first and second sheets by engaging a rivet of the first sheet within an aperture of the second sheet and then flexing the sheets to connect the rivet of the second sheet within an aperture of the first sheet to form a bowl, connecting the third sheet to the first and second sheets by engaging one rivet of the third sheet within a first set of adjacent apertures of first and second sheets and then flexing the third sheet to connect its other rivet with the second pair of adjacent apertures of the first and second sheets, and inserting the fourth sheet into the base of the vessel, underneath the third sheet, such that the fourth sheet abuts and extends between the rivets of the first and second sheets.