How to Reduce Picking and Packing Errors: 10 Practical Ways

Picking the wrong product, missing an item, or sending an order with the incorrect quantity might seem like small mistakes. But for an eCommerce business processing dozens or hundreds of orders daily, these errors can quickly add up.

Every incorrect shipment can lead to additional shipping costs, returns, replacement orders, and dissatisfied customers. It also creates extra work for warehouse teams that must identify and correct the mistake.

The good news is that most picking and packing errors are preventable. With organized inventory, clear picking instructions, proper verification, and consistent warehouse processes, businesses can significantly improve order accuracy.

In this guide, we’ll explore 10 practical ways to reduce picking and packing errors, common causes of fulfillment mistakes, and how to measure picking and packing accuracy.

Picking and packing errors are mistakes that occur when warehouse staff collect products for customer orders or prepare those products for shipment. Although picking and packing are closely related, they are two different stages of the order fulfillment process.

• Picking errors happen when employees retrieve incorrect products, quantities, or variations from storage locations.
• Packing errors occur when the collected products are incorrectly packed, omitted, mixed with another order, or prepared with incorrect shipping information.

Here are some common examples:

Error type	Example
Wrong product	Picking a blue T-shirt instead of a black one
Incorrect quantity	Picking two units when the customer ordered three
Missing item	Leaving one product out of a multi-item order
Wrong variation	Selecting a medium-sized shirt instead of a large
Order mix-up	Packing products from two different customer orders together
Incorrect shipping label	Attaching another customer’s shipping label to a package

These mistakes can happen in businesses of all sizes, from small eCommerce stores processing orders manually to large warehouses handling thousands of shipments.

When undetected, they can result in incorrect deliveries, inventory discrepancies, costly returns, and negative customer experiences.

Before improving fulfillment accuracy, it’s important to understand why mistakes happen.

Some of the most common causes include:

• Inaccurate inventory records: When recorded stock levels don’t match physical inventory, employees may pick the wrong products or encounter unexpected shortages.
• Poor warehouse organization: Storing similar-looking products together, using unclear labels, and using confusing storage arrangements increases the chance of selecting the wrong items.
• Manual picking processes: Relying on handwritten lists, memory, or verbal instructions makes it easier to overlook quantities or product variations.
• Inadequate employee training: Workers unfamiliar with product locations, picking procedures, or verification requirements are more likely to make mistakes.
• High order volumes: During peak shopping periods, employees may rush to meet fulfillment deadlines, increasing the likelihood of errors.
• Lack of verification: Without checking picked products against the original order, mistakes can remain unnoticed until the customer receives the shipment.

Most fulfillment mistakes result from a combination of these factors rather than a single issue. Addressing them requires improvements throughout the picking and packing process.

Reducing picking and packing errors doesn’t always require expensive warehouse automation. Even small improvements to inventory organization, documentation, and order verification can make a significant difference.

Here are 10 strategies to improve fulfillment accuracy.

1. Maintain Accurate Inventory Records

Accurate inventory records are essential for preventing picking errors.

If your inventory system shows a product as available when it is actually out of stock, warehouse employees may waste time searching for it or accidentally substitute another item.

To prevent these situations, keep your inventory data updated whenever products are received, sold, returned, or transferred between locations. Conduct regular stock counts to identify discrepancies between recorded and physical inventory. For businesses managing larger inventories, cycle counting can be more practical than performing a complete stock count every time.

If you sell through multiple channels, make sure inventory updates are synchronized to prevent conflicting stock information. The goal is to ensure that the products shown as available in your inventory system accurately reflect what warehouse staff can pick.

2. Standardize SKUs and Product Labeling

Products with similar names, packaging, or appearances are especially prone to picking errors. For example, a clothing store might sell the same T-shirt in five colors and six sizes. Without clear identification, an employee could easily select the wrong variation.

Assign a unique Stock Keeping Unit (SKU) to every product and variation. A simple SKU structure might look like this:

• TSH-BLK-M – Black T-shirt, Medium
• TSH-BLK-L – Black T-shirt, Large
• TSH-BLU-M – Blue T-shirt, Medium

Use these identifiers consistently across product listings, inventory records, shelf labels, and picking documents. Avoid using nearly identical labels that are difficult to distinguish. Including product names, sizes, colors, and other relevant attributes makes verification easier.

3. Use Detailed and Easy-to-Read Picklists

A picklist tells warehouse employees which products they need to collect to fulfill an order. Without a structured picklist, employees may rely on order summaries, handwritten notes, or memory, increasing the chances of missing items or picking incorrect quantities.

A well-designed picklist should include:

• Order number or picking reference
• Product names and SKUs
• Required quantities
• Product variations, such as size or color
• Storage locations, if maintained in your warehouse system

For example, instead of listing a product simply as “T-shirt – 2,” a picklist could specify “Black Cotton T-shirt – Size L – SKU TSH-BLK-L – Quantity 2.”

This provides the information employees need to identify the correct products. For stores processing multiple orders, grouping products by order or category can also make picking more organized.

4. Optimize Warehouse Layout and Product Placement

A poorly organized warehouse makes picking slower and increases the likelihood of mistakes. When similar-looking products are stored next to each other without clear labels, employees may pick from the wrong shelf or storage bin.

Organize products into clearly identified storage locations and use consistent shelf labeling. Place frequently ordered products in easily accessible areas to reduce unnecessary movement. Consider separating products with similar packaging or variations that employees commonly confuse.

For larger warehouses, arrange picking routes to minimize backtracking and unnecessary travel between locations. An organized warehouse makes it easier for employees to locate the right products and reduces confusion during busy fulfillment periods.

5. Choose the Right Order Picking Method

The picking method you use can also influence fulfillment accuracy. Different methods work better depending on warehouse size, product variety, and order volume.

Some common approaches include:

• Single-order picking: Employees complete one customer order at a time. This is straightforward and suitable for smaller stores.
• Batch picking: Employees collect products for multiple orders in one picking round. It reduces travel but requires careful sorting to prevent order mix-ups.
• Zone picking: The warehouse is divided into sections, and employees pick products from their assigned zones.
• Wave picking: Orders are released in scheduled groups based on factors such as shipping deadlines or fulfillment priorities.

For smaller eCommerce stores, single-order picking may be sufficient. As order volumes increase, batch or zone picking can improve efficiency. However, these methods should be supported by clear order identification and sorting procedures to prevent mixing products from different orders.

6. Introduce Barcode Scanning and Verification

Barcode scanning helps reduce mistakes caused by manual product identification. Instead of relying entirely on product names or visual checks, employees can scan an item’s barcode and verify it against the expected product in a connected warehouse or order management system.

For example, if an order requires a black T-shirt in size large, scanning the barcode of a medium-sized T-shirt can trigger a mismatch warning when the system supports item-level validation.

Barcode verification can help businesses with large product catalogs, multiple variations, or high order volumes. However, simply printing barcodes isn’t enough. The scanning system must be configured to compare the scanned item with the correct SKU, quantity, and order details.

Smaller businesses may begin with clear product labels and manual verification before investing in barcode-enabled fulfillment systems.

7. Double-Check Orders Using Packing Slips

Picking the correct products is only half the process. Employees must also ensure that the right items are packed into the correct shipment. A packing slip lists the items in a shipment, typically showing product names, quantities, and other relevant details.

Before sealing a package, employees can compare the collected products against the packing slip to confirm that:

• All required items are present.
• Product quantities are correct.
• Sizes, colors, and other variations match the order.
• Products belong to the correct customer order.
• The shipping label matches the intended shipment.

For businesses handling multiple orders simultaneously, use separate packing stations or clearly labeled containers to prevent order mix-ups.

A final verification step can help catch mistakes that were missed during picking, before they result in incorrect deliveries.

8. Standardize Picking and Packing Procedures

When employees follow different fulfillment procedures, order accuracy can become inconsistent.

Create a standardized workflow that clearly defines how orders should be picked, checked, packed, and dispatched. For example, a simple process might involve:

1. Retrieve the picklist for the order.
2. Collect the required products and quantities.
3. Verify the picked items against the order.
4. Transfer the products to the designated packing station.
5. Check the items against the packing slip.
6. Pack the order and verify the shipping label.

Document the procedure so every employee understands the required steps. For products that need special handling, such as fragile items or bundles, include additional instructions.

A consistent process makes training easier and reduces the chance that employees will skip important verification steps.

9. Train Warehouse Employees Regularly

Even well-organized warehouses can experience fulfillment errors if employees aren’t familiar with the products or processes.

Provide training on product identification, SKU interpretation, warehouse layouts, picking procedures, and packing verification. New employees should understand how to distinguish similar product variations and what to do when an item is missing, damaged, or incorrectly labeled.

Training shouldn’t be limited to onboarding. Conduct refresher sessions when introducing new products, changing warehouse layouts, or updating fulfillment procedures. Encourage employees to report recurring problems rather than silently correcting them. Their observations can reveal confusing labels, inaccurate stock records, or inefficient picking methods.

Clear training and communication help employees maintain accuracy even during busy periods.

10. Monitor Error Rates and Continuously Improve

Reducing picking and packing errors is an ongoing process.

Track fulfillment mistakes to identify patterns and determine where improvements are needed. For example, if employees frequently pick the wrong clothing sizes, the issue might be unclear variation labeling rather than a lack of training.

Similarly, repeated missing-item complaints could indicate that orders aren’t being verified properly before packing. Record important details whenever an error occurs, including the product, error type, fulfillment stage, and likely cause. Review this information regularly and focus on fixing recurring issues.

Rather than simply asking employees to be more careful, use the findings to improve workflows, inventory records, product labeling, and verification procedures.

For WooCommerce stores, maintaining accurate product information and using structured order documents can help reduce manual fulfillment mistakes.

WooCommerce provides order and inventory management functionality, but store owners may need additional tools to generate detailed picklists and streamline warehouse documentation.

One option is WebToffee’s WooCommerce Picklists plugin.

The plugin lets store owners generate, customize, download, and print picklists directly from WooCommerce orders. Some useful capabilities include:

• Automatic picklist generation: Generate picklists for orders based on configured order statuses.
• Product variation details: Include size, color, and other relevant product attributes to help employees identify the correct items.
• Product grouping: Organize items by order or product category for easier picking.
• Bulk printing: Print picklists for multiple WooCommerce orders at once.
• PDF email attachments: Send picklists to designated recipients when orders reach selected statuses.

For example, consider a WooCommerce store selling clothing in different sizes and colors. Instead of relying on a basic order summary, warehouse staff can use a picklist containing product names, SKUs, variation details, and required quantities. This gives them clearer information for collecting the correct items.

After picking, staff can verify the collected products against a packing slip before preparing the shipment. Together, these documents can help standardize the picking and packing process. However, barcode validation, physical warehouse location management, and real-time item scanning require additional systems where needed.

Once you’ve introduced improvements, the next step is to measure whether they’re actually reducing errors. Here are three useful metrics to track.

1. Picking Accuracy Rate

Picking accuracy measures the percentage of order lines collected correctly during the picking process.

Picking Accuracy Rate = (Correctly Picked Order Lines ÷ Total Order Lines Picked) × 100

For example, if warehouse employees pick 1,000 order lines and 990 are correct:

Picking Accuracy Rate = (990 ÷ 1,000) × 100 = 99%

Tracking this metric helps identify whether improvements to product labeling, picklists, or picking procedures are effective.

2. Packing Error Rate

Packing error rate measures the percentage of packed shipments with one or more packing mistakes.

Packing Error Rate = (Shipments With Packing Errors ÷ Total Shipments Packed) × 100

Suppose your warehouse packs 500 shipments and identifies errors in 10 of them.

Packing Error Rate = (10 ÷ 500) × 100 = 2%

This metric can reveal problems with missing items, incorrect quantities, order mix-ups, or final verification.

3. Order Accuracy Rate

Order accuracy rate measures the percentage of customer orders fulfilled correctly.

Order Accuracy Rate = (Orders Fulfilled Correctly ÷ Total Orders Fulfilled) × 100

If 490 out of 500 fulfilled orders are accurate:

Order Accuracy Rate = (490 ÷ 500) × 100 = 98%

For consistent measurement, define a correct order as one containing the right products, variations, quantities, and required shipment details. These metrics measure different stages of fulfillment, so they shouldn’t be treated as interchangeable.

Monitor them over time and compare results before and after making operational changes.

Picking and packing errors may be common in eCommerce fulfillment, but they don’t have to be an unavoidable part of running an online store.

By maintaining accurate inventory records, using detailed picklists, improving warehouse organization, and verifying orders before shipment, businesses can reduce mistakes and make fulfillment more efficient.

Start by identifying the most frequent errors in your current workflow. Introduce improvements where they’re needed most, measure the results, and refine your processes as order volumes grow.

For WooCommerce store owners, tools such as WebToffee’s Picklists and Packing Slips plugins can help organize fulfillment documentation and make order verification more consistent.