When you are shipping products, or even when you put products on the shelf in wait for a customer to pick up their order, you can print a packing slip. This provides the customer with information on what they can expect to be inside of the shipped container, or what is part of the order pickup. It’s a good checks and balances, and also provides you with a way to keep items on your shelf in wait for customer pickup organized so you know which order the products belong to.