Abstract: A laminated containment structure, and method of making, are disclosed. In one form, the containment structure is configured as an expansive secondary containment liner particularly suited for use in association with bulk storage tanks for hydrocarbon fuels and the like. In an alternate embodiment, the structure is configured as a sealable container suited for storage and handling of harardous materials. The containment structure is configured for efficient manufacture and installation, as well as a high degree of resistance to puncture and leakage. Manufacture is facilitated by first forming a plurality of elongated laminated strips each comprising a lamination of a polyester elastomeric layer and at least one non-woven geotextile fabric layer.

Abstract: A breather bag having a partial torus or weiner-like configuration is fabricated from four panels of flexible material. One of the panels is a side panel extending from one end of the bag to the other end along the inner concave curvature of the bag. The side panel also defines, at each end of the bag, a generally convex end surface. An offset dart seam may be provided in each convex end surface.