Abstract: A flexible-walled cylindrical container for pressurized liquid having an improved end construction of generally conical configuration recessed within the end edge of the cylinder, the conical end member having its edge turned toward the outside to form an annular wall which is fixed to the container wall. A rigid foam reinforcing annulus may be placed in the peripheral channel between the conical part of the base and the turned edge.

Abstract: A container of heat-sealable plastic material, such as PVC, is made by folding a sheet of that material into V-shape and doubling back the vertex of the "V" to form a W-shaped profile, the infolded section or gore of the "W" being sealed except at one or two locations where rigid guide sleeves are inserted and are tightly gripped by the surrounding sheet portions. Each guide sleeve accommodates a hollow plunger for the withdrawal or introduction of fluids, the plunger having a pointed tip designed to pierce the container wall at the ridge of the gore defining the central peak of the W. A resilient annular lip at the outwardly projecting sleeve extremity coacts with two sawtooth-profiled annular grooves on the plunger to index the latter inextractably in a withdrawn position before the piercing step and thereafter in an advanced position so as to prevent leakage.

Abstract: A free-standing container has a pair of like coextensive and outwardly convex side walls whose opposite lateral edges are heat-sealed together along straight seams to form an upright tube whose top and bottom are closed by respective upper and lower end walls each formed with a fold extending between the lateral edges of the side walls and each having a periphery subdivided into a pair of like sections by the respective fold line. Each section is joined to a respective side panel along a nonstraight seam line. This seam may be curved, in which case the end wall panels have circular or oval shape, or may be formed of a plurality of longitudinally joined straight sections in which case the end wall has a polygonal shape. The wall panels are all formed of a thermoplastic synthetic resin.