> For the complete documentation index, see [llms.txt](https://docs.commercelayer.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.commercelayer.io/core-api-reference/2026-05/packages.md).

# Packages

The package object and the allowed CRUD operations on the related resource endpoint

A package represents a physical box or pack — with predefined dimensions — that products get shipped in. Each [stock location](/core-api-reference/2026-05/stock_locations.md) can define its own set of packages, letting you model the different box sizes actually available there (e.g. small, medium, large).

## Dimensions and shipping rates

A package's `length`, `width`, and `height` — together with the `unit_of_length` (`cm` or `in`) — are required at creation time. [Shipping carriers](/core-api-reference/2026-05/carrier_accounts.md) use these dimensions to calculate shipping rates for the [parcels](/core-api-reference/2026-05/parcels.md) packed into them, so getting them right directly affects the rates your customers are quoted at checkout.

## Packages and parcels

When a [shipment](/core-api-reference/2026-05/shipments.md) is split into one or more parcels, each parcel is delivered in a package. A package's size is also surfaced in the `instructions` attribute of an [EasyPost pickup](/core-api-reference/2026-05/easypost_pickups.md), alongside the number of parcels associated with the shipment.


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