# Parcels

[Shipments](https://docs.commercelayer.io/core-api-reference/shipments) can be split into two or more parcels, that get tracked by the [shipping carrier](https://docs.commercelayer.io/core-api-reference/carrier_accounts). For cross-border shipments, you can fill in a customs form. The related documentation is automatically generated, updated, and attached to the parcel that will be delivered in a [package](https://docs.commercelayer.io/core-api-reference/packages) to the assigned customer's shipping address.

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<summary>Data model</summary>

Check the related [ER diagram](https://commercelayer.io/docs/data-model/parcels-and-packages) and explore the flowchart that illustrates how the parcel resource relates to the other API entities.

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