The Product Weight Default is used to inform the cost of your return shipping label only when a product weight is not listed in Shopify. You can edit the Product Weight Default under Settings in your Loop Admin. 

To generate a return shipping label, Loop sends the weight of each item included in a return request, combined with the Box Weight. When there is no weight listed for a certain product, Loop applies the Product Weight Default. 

To ensure costs for your shipping labels are accurate, it is important to individually configure product weights in Shopify. 

More information on the cost of shipping labels can be found here

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