Originally published on September 20, 2022
Last updated on March 6, 2026
What Is a Packing Slip and Why Is It Important
Many customers may disregard packing slips as soon as they open their packages. Yet, these pieces of paper are essential to many e-commerce businesses in various industries. Packing slips contain much information that helps businesses and customers evaluate what a package contains, reducing packing mistakes and improving communication between buyer and seller. While the availability […]
Many customers may disregard packing slips as soon as they open their packages. Yet, these pieces of paper are essential to many e-commerce businesses in various industries. Packing slips contain much information that helps businesses and customers evaluate what a package contains, reducing packing mistakes and improving communication between buyer and seller.
While the availability of digital order receipts and purchase histories make packing slips less vital in an increasingly technology-focused world, many e-commerce businesses still require packing slips for products they’re shipping. Packing slips help companies fulfill orders more quickly and accurately and may be used to verify package contents, making the shipping process more accurate.
What Is a Packing Slip?
A packing slip is a document typically included inside a package that contains an itemized list of the products inside. Packing slips are an inventory packing list to help warehouse workers and customers determine what the box should contain.
Packing slips are often printed on simple sheets of paper and go inside the box along with the products in the order. Depending on the order in question, packing slips may contain the information for a single order or a batch.
These slips of paper play a crucial role in most e-commerce operations. Nearly every step of the shipping process uses packing slips:
Product picking: The shipping department prints packing slips during the product picking stage to ensure the correct items go into the package. The barcode pick and pack method, one of the best order picking methods for warehouses, uses packing slips to separate picked items into the correct boxes for order fulfillment.
Order verification: The receiving department uses packing slips for order verification. Workers will check the contents of the box against the packing slip to check for discrepancies before sending the package for shipping.
Business owners: The information on packing slips alerts business owners of the descriptions of items within the box so they can apply the appropriate shipping rates.
Shipping handlers: Packing slips tell shipping handlers important information about handling each package to prevent damaging the items inside.
Customers: Once a package arrives, customers can look at the packing slip to verify whether their order was correct.
What Should Packing Slips Include?
Packing slips provide several kinds of information to help businesses pack orders correctly. Although the exact type of information on a packing slip varies between companies and products, you’ll typically find the following details:
1. Buyer and Order Information
Packing slips include several details about the purchaser and the order, including:
The buyer’s name and shipping address
The order date
The buyer’s contact information
2. List of Items in the Package
Packing slips contain a list of the products in the order, including the type and descriptions of each product and other details like color and style. A packing slip may also include a list of the items shipped separately.
3. Quantities of Products
Buyers may purchase multiple products of the same type. In this case, including the quantities next to each item prevents the packing slip from being several pages long. Warehouse employees reference the number of each product type to include while they pack boxes for shipping.
4. Product Weight
Packing slips identify the general dimensions and weight of the products inside the box. Knowing the weight of the package helps businesses identify the correct shipping rates.
5. SKU or UPC
Businesses manage their inventory using unique identifying codes assigned to each product. These codes could be stock-keeping unit (SKU) numbers, universal product codes (UPCs) or quick response (QR) codes. Many e-commerce businesses print barcode labels on their packing slips to help with inventory management.
Is a Packing Slip the Same as a Shipping Label?
Warehouse workers could confuse packing slips with shipping labels, yet these are separate documents that serve different purposes. Here are a few differences between the two types of documents:
Intended purpose: Packing labels direct warehouse workers on the correct items in an order and clarify package contents to the customer. A shipping label’s role is primarily in shipping, where carriers use them to track and ship packages. Businesses also use shipping labels in inventory management.
Location: Businesses always place shipping labels on the outside of the packages to ensure carriers can read and scan the information. In contrast, packing slips go inside the boxes.
Information: Both types of documentation include the buyer’s name and address, the package’s weight and the business name and address. However, shipping labels don’t have details about the items in the order and instead display the shipping date, priority and delivery instructions.
What Is the Difference Between a Packing Slip and an Invoice?
Another type of documentation that workers could confuse for a packing slip is the invoice, which also serves a different purpose and includes other details. Invoices are financial documents that keep customers accountable for the terms of payment. When comparing a packing slip vs. an invoice, the differences include:
Intended purpose: Whereas packing slips are intended for the warehouse workers and recipient of the package, invoices are for the purchaser of the order. In many cases, the purchaser and recipient are two different people.
Information: Invoices include several details that packing slips don’t, such as the cost of each product, payment method and date of purchase.
Stage of the ordering process: Customers trigger the creation of invoices when they make a purchase on the e-commerce platform. The warehouse creates a packing slip when it uses its order fulfillment technology to start the packing process.
Why Are Packing Slips Important?
E-commerce businesses gain several benefits from creating packing slips in their shipping process. This documentation helps companies connect purchases in the digital space to physical products and customers. Packing slips are important because they:
1. Ensure Order Correctness
Customers ordering from e-commerce businesses cannot personally ensure they receive the correct items. Incorrect orders can be costly for companies handling returns and possible refunds. Packing slips improve the process of order fulfillment by giving warehouse workers and customers a blueprint for what packages should include. Employees and customers can check packing slips to ensure every order contains the right items.
2. Improve Order Tracking
Businesses sometimes ship items in separate packages, depending on the location of each item in different warehouses or the size of the products. Packing slips allow employees to track multiple products within an order.
3. Identify Damaged Products
Packing slips are also helpful when sorting out damaged items in a shipment. Businesses can use packing slips to resend packages or issue refunds more quickly.
4. Increase Customer Satisfaction
Packing slips demonstrate that your business cares about accuracy in order fulfillment. Customers who receive the correct items in their order are more likely to be satisfied with your business and may order again.
Manage Your Order Fulfillment With Finale Inventory
Packing slips can help your business fulfill orders properly, which is essential for maintaining efficiency in your daily operations. Finale Inventory is a cloud-based inventory management solution that helps growing e-commerce businesses simplify order tracking, fulfillment, stock replenishing and more to work more efficiently.
Finale Inventory works alongside your warehouse documentation to improve visibility into package movement while saving costs. Our personalized approach enables our experienced domain experts to craft a solution that meets your specific business needs. Schedule a demo today to see Finale Inventory at work!
“The core of maturity, that I see, is starting with a unified view of inventory. I’ve got to be able to accurately represent what do I have, make sure that I know where it’s located so I can get it to my customers quickly.”
— Troy Graham, Descartes
What is the first thing I should fix if I want to scale operations?
Start with a unified view of inventory. The core of maturity starts with being able to accurately represent what you do have and make sure that you know where it’s located to get it to customers quickly. Without a unified view across your warehouses, 3PLs, and vendors, you cannot make the best decisions because you don’t have the best information at hand.
With Inventory Visibility, Businesses Can Make Smarter Allocation Decisions
Once inventory is centralized, businesses can move from reactive updates to intentional allocation. They can decide how much inventory to expose to each channel, when to use buffers, which marketplaces need extra protection, and how seasonality or campaign performance influence availability.
Once I know what inventory I have, how should I decide where to make it available?
Inventory allocation should reflect where orders are coming from, where marketing is working, and which channels carry the most risk. Once you know what you have and where it is located, you can think more strategically using centralized inventory to make prioritization happen automatically. One fertilizer company lost a little over 5,000 orders in one weekend because someone manually uploaded the wrong available inventory to Amazon.
Better Inventory Data Improves Planning, Purchasing, and Growth Bets
Better visibility turns inventory data into a planning tool. With insight into sales velocity, inventory levels, vendors, and channel performance, businesses can make more informed replenishment decisions, avoid overbuying, and test new product lines or vendor-supplied inventory without taking on unnecessary risk.
“You have to have unified inventory to know how to price your products just at that basic level. I can’t price my products if I don’t know the true cost to get it.”
— Mike Bernico, Flxpoint
How does better inventory data help me make smarter buying decisions?
It lets you measure whether your plan is working before you commit more capital. A key question becomes: “Did my plan work? Am I overleveraged in one place or another?” Centralized systems can also help businesses test new product lines or vendor relationships by looking at sales velocity by channel, allowing them to take risks in a calculated and measured way.
Intelligent Order Routing Turns Inventory Complexity Into Automation
Once inventory and supplier data are reliable, businesses can automate fulfillment decisions. Orders can be routed based on cost, speed, margin, location, warehouse priority, vendor fallback, split-shipment rules, or customer expectations. This helps hybrid fulfillment scale because every order does not need a manual review.
How do I decide the best way to fulfill each order?
There is no single answer, which is why order routing needs to account for the context of each order. Intelligent order routing is not just sending an order to someone who has stock; it is taking each and every order and treating it like its own unique use case. Depending on the order, the business may prioritize speed, margin, an internal warehouse, vendor fallback, or preventing split shipments.
Supplier Inventory Sync Extends Inventory Beyond the Four Walls
For hybrid fulfillment to work, supplier inventory needs to become part of the operating model. Supplier sync does not always require advanced technology; it can happen through automated files, FTP, email, APIs, EDI, or ecommerce storefront integrations. The key is replacing manual updates with automated, reliable supplier data.
Can supplier inventory really be treated like part of my own inventory?
Yes, but the goal is not necessarily to force every supplier into a complex integration. Real-time supplier sync can be defined as any way to get an automated update from a supplier, such as Google Sheets, email, FTP, API, EDI, or ecommerce storefront connections. The key is that accurate supplier stock is foundational. If you don’t have an accurate view of what is in stock with your suppliers, you cannot tell your sales channel accurately what’s available.
Exception-Based Workflows Keep Humans Focused Where They Matter
Automation does not remove people from the process. Mature operations let technology handle the routine majority while humans focus on exceptions, such as high-value orders, fraud risk, compliance requirements, restricted products, export rules, or unusual fulfillment scenarios.
If my business has special cases, can automation still work?
Yes. The point is not to automate every possible decision; it is to automate the routine work and surface the exceptions. Businesses should not have to look at every single order. Instead, technology can highlight high-value orders, risky locations, or compliance requirements. The goal is to take care of the 80% of workflows that are obvious while still allowing human review when specific exceptions arise.
The Right Inventory Technology Should Fit the Business, Not Overwhelm It
Software decisions should be based on business fit, not popularity, feature volume, or broad “all-in-one” promises. Growing ecommerce businesses should identify their highest-impact bottleneck, prioritize what matters now, and choose technology that is right-sized but flexible enough to support future phases of growth.
How should I choose software without overbuying or picking the wrong system?
Start with your priorities, not the biggest feature list. Avoid an all-in-one system that claims to “do everything under the sun” and look for a “best of breed approach” with systems that can scale as you add channels or vendors. The practical advice is to stack rank what matters now, make sure the system can support future phases, and choose technology that fits your business rather than overwhelming it.
How to Scale Ecommerce Operations Beyond Spreadsheets
For many growing ecommerce businesses, Finale and Flxpoint work together as a practical answer to these challenges. Finale helps centralize and manage internal inventory, purchasing, warehouse operations, and stock visibility, while Flxpoint helps connect vendor inventory, automate supplier sync, and route orders across hybrid fulfillment networks. Together, they give businesses a best-of-breed way to improve inventory accuracy, reduce spreadsheet work, and scale fulfillment without forcing every process into a one-size-fits-all system.
Ecommerce Fulfillment Operations FAQ
What Is Ecommerce Fulfillment Operations?
Ecommerce fulfillment operations are the processes that move an online order from purchase to delivery. This includes managing inventory, syncing product availability across channels, routing orders to the right warehouse, 3PL, supplier, or vendor, and making sure the customer receives the right product on time. As discussed in the webinar, fulfillment is no longer limited to “what’s in my warehouse these days”; growing businesses may rely on internal warehouses, 3PLs, marketplace fulfillment services, and supplier inventory at the same time.
What Are Ecommerce Fulfillment Operation Examples?
Examples of ecommerce fulfillment operations include updating inventory across Shopify, Amazon, Walmart, and other sales channels; allocating inventory to specific marketplaces; sending orders to an internal warehouse, 3PL, or vendor; syncing supplier inventory through files, APIs, EDI, email, or FTP; replenishing warehouse stock based on sales velocity; and flagging exceptions such as high-value orders, compliance requirements, or restricted products. In the webinar, the speakers also discussed hybrid fulfillment examples where a business may fulfill some products from its own warehouse and use vendors as a fallback or extension of available inventory.
How Can I Track My Inventory at an Ecommerce Fulfillment Center?
The best way to track inventory at an ecommerce fulfillment center is to create a unified inventory view that shows what is available, where it is located, and how that inventory connects to each sales channel. That means tracking inventory across internal warehouses, fulfillment centers, 3PLs, marketplace fulfillment programs, and supplier locations instead of relying on disconnected spreadsheets. The webinar emphasized that businesses need to “accurately represent” what they have and know where it is located so they can get products to customers quickly.
How Can I Connect My Inventory to My Supplier?
You can connect supplier inventory through several methods, depending on what the supplier supports. The webinar discussed low-tech and advanced options, including automated Excel or CSV files, Google Sheets, email updates, FTP servers, APIs, EDI, and direct connections to ecommerce storefronts such as Shopify, BigCommerce, or Magento. The key is to ask suppliers how they share inventory today, then use a system that can automate that data flow instead of manually copying supplier inventory into spreadsheets.
What Is Ecommerce Order Routing?
Ecommerce order routing is the process of deciding where an order is fulfilled from after a customer buys. In a simple operation, every order may go to one warehouse. In a more complex or hybrid fulfillment model, the best fulfillment source may depend on inventory availability, shipping speed, cost, margin, customer location, warehouse priority, vendor fallback rules, or whether the order should be split. The webinar described intelligent order routing as treating each order like its own use case, so businesses can automate the best fulfillment decision without manually reviewing every order.
