Configurations for a packing container formed from a single, preformed, rigid unit of generally U-shaped cross-section are disclosed. One configuration utilizes three end closures to enclose an object with an elevated end. Another configuration employs three end closures to enclose an object with an elevated mid-section. A third configuration uses two end closures to enclose an object with random elevations. With three end closures, a fourth configuration encloses two or more dissimilar objects in separate compartments. The fourth configuration is especially useful for items that should be prevented from touching or intermingling during shipping. A fifth configuration combines elements of the other four configurations, allowing a user to ship objects with elevated ends, elevated mid-sections, or random elevations in separate compartments. A sixth configuration encloses one or more objects with two end closures that are about equal in length to one another. A device for forming the container is also disclosed.