> ## Documentation Index
> Fetch the complete documentation index at: https://documentation.claruswms.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Prerequisites for Shipments

> Configure storage units, product weights, and carriers before creating shipments in your warehouse.

## Shipping Setup Guide

Before you can create shipments, you need to configure storage units, product weights, and carriers. Follow these steps to ensure everything is set up correctly.

<Steps>
  <Step title="Create a storage unit type for packages">
    Set up a new storage unit type for your packages (e.g., **CARDBOARDBOX01**). Make sure you select the **Leaves Warehouse** option. You can use an existing sequence for the storage unit reference or create a new one.

    You must also input the **height**, **width**, and **length** for this storage unit. These dimensions will be used as the default package size for your shipments.
  </Step>

  <Step title="Ensure products have associated weights">
    Every product must have a weight assigned in the stock unit type you use for picking. This product weight will be used as the default weight for your shipments.

    <Warning>Without weights assigned to products, the system cannot calculate package weights for shipments, which may lead to shipping errors.</Warning>
  </Step>

  <Step title="Select and set up the carrier">
    Add a new carrier or edit an existing one for the courier you plan to use. After selecting a carrier type, enter the authentication details (username and password) for the courier's online portal.

    <Warning>Authentication details must be obtained directly from your courier. They are not provided by the system.</Warning>

    You can use the **Test Carrier Type** option to test the shipping integration before going live. For testing, you can enter any username and password and turn on test mode.
  </Step>

  <Step title="Add carrier services">
    Once your carrier is set up, add one or more carrier services (e.g., **Guaranteed Next Day**). Give each service a descriptive name matching the courier's own naming convention.

    You can use carrier service presets to quickly configure these services. Only adjust advanced settings if you fully understand their impact.
  </Step>
</Steps>