A non-standard parcel is any parcel whose characteristics prevent it from being counted as a standard parcel. The term is usually used to describe parcels that are very heavy, large or disproportionate in size or irregular in shape, but classification into this group can also be made on the basis of other factors.
Non-standard consignments also include items or devices that generate a magnetic field, parcels containing loose, heavy items or without packaging (or wrapped in stretch film only, for example). Other characteristics of a non-standard consignment may be an offset centre of gravity (for example, being close to one of the edges of the parcel) or that it is made up of a number of separate parts joined together and the sum of the dimensions of all the individual elements is greater than permitted. Parcels that are round, cylindrical or triangular in shape or that contain fragments made of unusual materials (e.g. wood, metal, fabric) or protrusions on their surface also fall into this category.
All of these characteristics make a custom consignment a much more difficult object to transport and require special measures to protect its contents from external factors. For large parcels, a manual sorting procedure is usually used. The automated process cannot be used for most other custom consignments either, for a number of reasons. This problem can apply, for example, to parcels with a sticky surface (or in rubber packaging), as this is the material that prevents the item from moving freely along the belt in the sorting plant.