Looking for packing slip line_item."X" / X = product_type

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I am looking for a way to get the product type to the packing slip items. 
Due to our fulfilment they like to have these shown to know faster what to search. 

I tried & read a lot about line_item. attributes but the product type seems not to exist. 
While searching I just found something like item.product.type but this does not work in a packing slip line_item environment. 

Perhaps you guys here have an idea to referre to the product type within the line_item on a packing slip. 

BR Julius