Labels and Inserts

In fulfillment, labels and inserts are the visible interface between warehouse operations and the customer experience. While the shipping label ensures logistical routing, packing slips, return instructions, and marketing inserts deliver information that directly affects return rates, customer satisfaction, and brand perception. Label errors lead to delivery delays, carrier rejections, and costly rework. Incorrect or missing inserts generate support requests and weaken the unboxing experience.

This guide explains which label and insert types are used in e-commerce fulfillment, how to integrate them into your packing station workflow, and which legal, technical, and economic aspects you need to consider.

Why Labels and Inserts Are Strategically Important

Every shipped order carries at least one shipping label and often several accompanying documents. On average, two to four physical information media are processed per parcel: address label, packing slip, return notice, and optionally a promotional insert or warranty card. At 1,000 shipments per day, that equals 2,000 to 4,000 printing and application operations.

The strategic relevance becomes clear across six dimensions:

• Delivery reliability - Readable barcodes and correct address data prevent misdeliveries
• Carrier compatibility - Label size, position, and adhesion must meet sorting system requirements
• Legal compliance - Packing slips, cancellation notices, and invoice copies fulfill legal obligations
• Returns management - Prepaid return labels and clear instructions lower return barriers
• Brand loyalty - Well-designed inserts turn standard parcels into experiences
• Process efficiency - Standardized label formats accelerate pick-pack-ship

Overview of Label Types in Fulfillment

In e-commerce fulfillment, labels can be divided into four main categories: shipping and address labels, product labels, handling and warning labels, and internal warehouse labels.

Shipping and Address Labels

Shipping labels are generated via carrier interfaces or shipping software and include recipient address, tracking number, barcode, and carrier logo. Standard formats in the German market are 105 x 148 mm (DIN A6) or 100 x 150 mm.

1. Direct thermal labels - Fast printing, no ink, ideal for high-volume shipments
2. Thermal transfer labels - Higher UV and abrasion resistance for international shipments
3. Multi-carrier labels - Standardized format for DHL, DPD, GLS, and UPS from one system
4. Return labels - Prepaid or with return tracking, often included inside the parcel

Product Labels and Barcode Labels

Product labels identify items in the warehouse and optionally inside the parcel: SKU barcodes, EAN stickers, batch labels, and expiry date labels. They are applied to products or packaging at goods receipt or before packing.

Handling and Warning Labels

For bulky goods, fragile items, or hazardous goods, standardized symbols and texts are required.

• Top / This Side Up - Orientation indicator for sensitive goods
• Fragile symbol - Supplement to internal cushioning
• Hazard labels - Mandatory for regulated substances according to ADR/IMDG
• Euro pallet and SSCC labels - For B2B and pallet shipping

Internal Warehouse Labels

Pick labels, storage location labels, and shipping pouch labels are used for internal control. They do not leave the warehouse with the customer shipment. Visually separate internal and customer-facing labels, for example by using different color schemes.

Inserts: Documents and Marketing in the Parcel

Inserts are all non-product materials handed over to the customer with the shipment. They differ from labels because they are informational or promotional in nature and are usually placed inside the carton rather than attached outside.

Mandatory and Informational Inserts

These inserts fulfill legal or procedural requirements:

1. Packing slip / Packing list - Item overview with quantities, SKU, and where applicable batch numbers
2. Invoice copy or invoice reference - In B2B and on request in B2C
3. Cancellation policy and sample form - Mandatory consumer information for distance selling
4. Return instructions - Step-by-step guide including deadlines and item condition requirements
5. Warranty card and CE conformity - Especially for electronics and regulated products

Marketing and Experience Inserts

Optional inserts strengthen brand loyalty and repurchase rates:

• Thank-you card - Personal message with QR code for reviews
• Voucher or discount code - Cross-selling and newsletter signup
• Product catalog or upsell flyer - Complementary items from the same collection
• Sustainability notice - Disposal of packaging material and recycling information
• Sample or product trial - In beauty and food categories with regulatory requirements

Label Printing and Technical Integration

Label production is tightly connected to the WMS, shop system, and carrier interfaces. Data chain errors appear as incorrect addresses, duplicate tracking numbers, or barcodes that cannot be scanned.

Printers and Media

Three printing solutions are established in fulfillment:

1. Direct thermal printers - Standard for shipping labels, typically 203 or 300 dpi
2. Laser printers - For packing slips, invoices, and document inserts in batch printing
3. Inkjet printers - Colored marketing inserts in lower volumes

The choice of media affects scan rate and durability. Direct thermal labels fade faster under heat and UV light than thermal transfer labels. Thermal transfer is recommended for long transport times or outdoor storage.

Software Workflow

The typical label printing process in the packing workflow:

1. Order is released in the WMS and pick list is generated
2. After picking, the packer scans the order at the packing station
3. Shipping software determines carrier and rate and generates label PDF or ZPL
4. Label is printed, applied, and tracking number is sent back to the shop system
5. Packing slip and inserts are printed and inserted in parallel or sequentially

Placement and Quality Standards

The position of the shipping label on the carton affects scan rates in hub systems and the stability of the closure.

Correct Label Position

Carrier and machine readability requirements include:

• Top side of the carton - Largest flat surface, free of tape over the barcode
• Minimum distance of 20 mm from edges - Prevents cutoff on conveyor systems
• Do not place barcodes over corners or seams - Distortion causes scan failures
• Do not cover old labels - When relabeling, remove the old label completely

Insert Handling

Inserts are placed after filling and before sealing:

• Place packing slip on top of goods or in a document-safe pouch on the carton flap
• Place return label in a pre-printed envelope or perforated for easy peel-off
• Do not place marketing inserts between cushioning and product so they are not overlooked

Checklist: Label and Insert QC Before Sealing

• Address on label matches the order
• Barcode fully visible and undamaged
• No label over carton seam or adhesive tape strips
• Packing slip quantities match picked goods
• Return label included and valid for active return campaign
• Mandatory inserts included per SKU set
• Marketing inserts placed according to packing instruction per SKU
• No confidential internal labels inside the parcel

Costs, Sustainability, and Scaling

At high shipping volumes, labels and inserts are a relevant cost block. A realistic calculation includes consumables, printer amortization, labor time, and error costs.

Sustainable Alternatives

• Recyclable label liners - Paper-based labels instead of plastic film, where carrier-compatible
• Digital inserts - QR code on thank-you card links to return portal instead of multi-page flyers
• Reduced print scope - Packing list with item numbers only, details in customer account
• Packaging optimization - Less void fill through right-sized cartons reduces extra materials

Integration into Packing Instructions and SKU Logic

Not every order requires the same inserts. Packing instructions per SKU and customer segment should define which labels and inserts are mandatory.

SKU-Specific Specifications

• Standard SKU - Packing slip, cancellation policy, thank-you card
• Electronics SKU - Plus warranty card and battery disposal notice
• Hazardous goods SKU - Handling label outside, safety data sheet as insert
• Premium SKU - Branded shipping label, premium packaging, personalized card
• B2B SKU - Invoice copy, packing slip with customer purchase order number, no marketing

Automation and Rule Sets

Modern WMS systems control inserts via rule sets:

1. If category return rate exceeds 15%, include return label automatically
2. If order value exceeds threshold, add premium thank-you card
3. If first order is detected, include welcome flyer with discount code
4. If repeat buyer is detected, provide loyalty program notice instead of voucher
5. If shipment is international, include customs documents instead of German cancellation policy

Unboxing Experience and Branding

Labels and inserts are key levers for unboxing and branding. The external shipping label is usually carrier-standard, while the brand experience unfolds inside the parcel.

Design Principles

• Consistency - Same fonts and colors as in the online shop
• Readability - Packing slip with clear structure, no full-bleed background graphics
• Tactile quality - Thicker paper quality for thank-you cards signals value
• Personalization - First names on cards increase perceived attention
• Call to action - One clear next step per insert

Common Mistakes and How to Avoid Them

The following mistakes cause most issues with labels and inserts:

1. Wrong address on the label - Enable address validation before label printing
2. Label applied on seam - Add a position sketch to packing instructions at the packing station
3. Duplicate tracking numbers - WMS lock after label printing until shipping confirmation
4. Missing packing slip - Introduce mandatory scan before sealing
5. Outdated return label - Generate label only during packing
6. Too many inserts - Packing time and environmental performance suffer
7. Internal labels inside parcel - Remove pick labels before sealing

FAQ: The Five Most Frequent Questions

Must an invoice be included in the parcel? Not mandatory in B2C if provided electronically; often expected in B2B.

Should a return label always be included? Only if your return process requires it, otherwise via online portal.

Direct thermal or thermal transfer? Direct thermal for standard domestic shipping, thermal transfer for heat, UV, and export.

Where should the shipping label be placed correctly? On top of the largest surface, barcode flat and free from tape.

How can insert costs be reduced? Segment, digitize, and bundle print volume.

Related Topics

• Adhesive tapes and closure
• Cartons and void fill
• Quality control during packing
• Shipping label and postage (Glossary)
• Unboxing and branding

Last update: July 6, 2026