Many components or subassemblies will frequently need to be packaged in a single enclosure. A foam pack may consist of several layers of foam shapes and trays designed to isolate each component. When cost is an issue, standard foams work well and are easy to fabricate. If appearance and durability or cleanliness are more important, specialty foams can be used because they last longer, have better performance, and have a better look and feel. The foam pack can also be designed to protect different products or models having some similar dimensions with the use of perforations,
removable inserts and the like. When several packaging goals are important such as to provide separate protection, organization, and aesthetic presentation, it is crucial to work with an experienced designer.