The packing slip is a type of document that includes a list of the items included in the package. This includes the Weights, SKU numbers, Size, Date, Order, and more(depending on the store setup).
To print a packing slip, follow these steps:
Go to Admin -> Sales -> Orders -> Select the order you want -> Click the arrow button next to Actions -> Select Print Packing Slips -> Open with Browser -> Print
Package slips will look like this: