You can set the default package dimensions that are sent to Amazon when booking a Seller Fulfilled Prime shipment. This can help to ensure that you pay the correct amount for the postage purchased for your shipments.
Set Default Package Sizes
To set your Default Package Dimensions, from your Amazon Seller Fulfilled Prime settings page, click on the grey Advanced Settings icon in the bottom left of the page.
Enter the width, height and depth of the package, in centimetres and click the Save button to save your changes.
Shipment Format Options
Amazon offers a list of pre-determined package sizes which are available in Shiptheory under the Formats list. When creating a shipping rule or manually booking a shipping label, you can select one of these package sizes to be used and override the default package size saved in your Shiptheory Amazon Prime settings.