A system for transporting fluid cargo within a shipping container, the system comprising an open topped box having side walls and end walls and a flexible membrane which either independently or in combination with the box contains the fluid cargo. The box supports the portion of the cargo within the box and is designed to flex and absorb at least part of the horizontal forces generated within the cargo during its transportation thus preventing overloading of the walls of the surrounding container. The membrane may be a bladder which completely encloses the cargo and is disposed partially within the box to contain the cargo independently of the box. The box may have a floor pan which can seal the box against leakage of any cargo.

A plastic article useful as a riser assembly for a septic tank or as part of another structure is comprised of a multiplicity of identical shape conical wall plastic risers. The risers are attached to each other at joints by tabs which engage rim segments; each end of the riser has alternating tabs and rim segments. A riser assembly wall undulates in the lengthwise direction. The risers nest within each other for shipment or storage.

A plastic article useful as a riser assembly for a septic tank or as part of another structure is comprised of a multiplicity of identical shape conical wall plastic risers. The risers are attached to each other at joints by tabs which engage rim segments; each end of the riser has alternating tabs and rim segments. A riser assembly wall undulates in the lengthwise direction. The risers nest within each other for shipment or storage.

A heavy duty container includes a plastic base having a plurality of vertical corrugations. A separate plastic liner is placed inside the base. The liner is smooth to allow materials to fall out easy and not catch or build up in corners. The container can be moved with a fork lift and serviced with a front loader truck.

Risers for use in a riser assembly to provide access to below-grade chambers or vaults are provided. Risers may include an angled wall connecting a first end and a second end spaced apart along a central lengthwise axis. In an embodiment, the riser may include a plurality of latches spaced around the first end and the second end with radially extending lips and canted terminal end surfaces. A plurality of receivers may be spaced between the first plurality of latches on the first end and the second end. Alternatively, plurality of latches may include a first and second latch body extending to a terminal end that comprises a first circumferentially extending lip and a first canted terminal end surface. Risers may be configured to connect to other risers to form a riser assembly.

A plastic article useful as a riser for a septic tank or as a water tank article is comprised of a multiplicity of plastic rings which are attached vertically to each other at joints. Ring pairs which alternately have inward and outward sloping conical walls nest within each other for shipment or storage. A lid is shaped for use with the topmost ring to cover the opening irrespective of which conical shape the ring has.

A plastic article useful as a riser assembly for a septic tank or as part of another structure is comprised of a multiplicity of identical shape conical wall plastic risers. The risers are attached to each other at joints by tabs which engage rim segments; each end of the riser has alternating tabs and rim segments. A riser assembly wall undulates in the lengthwise direction. The risers nest within each other for shipment or storage.

A plastic article useful as a riser assembly for a septic tank or as part of another structure is comprised of a multiplicity of identical shape conical wall plastic risers. The risers are attached to each other at joints by tabs which engage rim segments; each end of the riser has alternating tabs and rim segments. A riser assembly wall undulates in the lengthwise direction. The risers nest within each other for shipment or storage.

A plastic article useful as a riser assembly for a septic tank or as part of another structure is comprised of a multiplicity of identical shape conical wall plastic risers. The risers are attached to each other at joints by tabs which engage rim segments; each end of the riser has alternating tabs and rim segments. A riser assembly wall undulates in the lengthwise direction. The risers nest within each other for shipment or storage.

An intermodal container handling system for collapsing a collapsible intermodal container including a pair of opposing side walls each hingedly connected to a roof and a floor respectively, wherein said walls remain substantially parallel to one another whilst the collapsible container is collapsed from an expanded configuration to a collapsed configuration, said handling system comprising: a docking assembly adapted for docking of the collapsible intermodal container in the expanded configuration; a collapsing assembly operatively coupled to the docking assembly via a transit assembly adapted to releasably engage the docked collapsible container to facilitate movement of said collapsible container between the docking assembly and the collapsing assembly; a folding sub-assembly associated with the collapsing assembly, said folding sub-assembly adapted for releasable engagement with a first of the pair of opposing side walls wherein movement of the folding sub-assembly and the associated first side wall relative to a second of the opposing side walls collapses said container between the expanded configuration and the collapsed configuration; a stacking assembly operatively coupled to the collapsing assembly via the transit assembly adapted to facilitate movement of the container between the collapsing assembly and the stacking assembly for stacking in a vertical orientation with a further collapsible intermodal container in a collapsed configuration and vertical orientation.