Wholesale Packaging and Shipping Requirements
Inner Pack vs Outer Case vs Master Case
Wholesale packaging operates in layers. The inner pack is the individual product unit with its retail-ready packaging (the box, bottle, bag, or blister pack that goes on a store shelf). The outer case (also called a shipping case or carton) contains a fixed number of inner packs (typically 6, 12, 24, or 48 units) for bulk shipping and warehouse storage. The master case is an optional larger unit that contains multiple outer cases, used primarily for pallet-level shipping and distribution center receiving.
The inner pack must be retail-ready with product branding, UPC barcode, product information, and any required regulatory labeling. The outer case must be sturdy enough to protect inner packs during freight shipping (where cases are stacked, shifted, and handled by forklifts), labeled with the product SKU, quantity, UPC, and case barcode for warehouse scanning, and sized to stack efficiently on standard pallets. The relationship between these layers affects everything from your manufacturer's production runs to your buyer's warehouse efficiency, so design your case quantities thoughtfully.
Case Packing Standards
Choose case quantities that make operational sense for both you and your buyers. Standard case quantities are 6, 12, 24, or 48 units, chosen based on product size and weight. A case should weigh no more than 40 to 50 pounds to allow manual handling by warehouse staff without equipment. If a case of 24 units weighs 60 pounds, reduce to 12 units per case. Cases should be sized to fit efficiently on a standard 48x40 inch pallet (the GMA pallet used across North American logistics). Common case footprints that tile well on GMA pallets include 12x12 inches (16 cases per pallet layer), 12x16 inches (12 per layer), and 16x20 inches (6 per layer).
Use corrugated cardboard rated for the weight and stacking requirements of your shipments. Single-wall corrugated (also called C-flute) handles products up to about 30 pounds per case and is standard for most wholesale products. Double-wall corrugated provides additional crush resistance for heavier products (30 to 65 pounds per case) or products that require stacking 5 to 6 cases high on pallets. Your corrugated supplier can recommend the right board strength (measured in ECT, Edge Crush Test, or Mullen Burst Test) for your specific product weight and stacking requirements.
Labeling Requirements
Case Labels
Every outer case needs a label that warehouse staff can read and scan without opening the case. The case label should include your company name and logo, product name and variant (color, size, flavor), SKU or item number, UPC barcode or ITF-14 barcode (the standard barcode format for cases, based on your product UPC), quantity of units in the case, case weight and dimensions, country of origin, and lot number or date code for traceability. Position the label on the long side of the case, centered vertically, so it is visible whether the case is stacked on its side or standing upright. Print labels on weatherproof label stock if your products ship in environments where moisture could smudge ink.
Pallet Labels
Palletized shipments need a pallet label (also called a license plate label) on two adjacent sides of the pallet, typically the two sides that face outward when the pallet is staged for loading. The pallet label includes the buyer's purchase order number, total case count on the pallet, total unit count, ship-to address, and a GS1-128 barcode (also called an SSCC or Serial Shipping Container Code) that uniquely identifies the pallet for tracking through the supply chain. Large retailers absolutely require GS1-128 labels, and non-compliant shipments receive chargebacks or outright rejection at the distribution center dock.
Retailer-Specific Requirements
Chain retailers publish detailed vendor compliance guides (also called routing guides) that specify their exact labeling, packaging, and shipping requirements. These guides dictate label size and placement, barcode symbology and dimensions, packing slip format and contents, pallet configuration (case orientation, stacking pattern, maximum height), and shipping carrier and delivery appointment scheduling. Read your buyer's routing guide thoroughly before shipping, because non-compliance costs you money through chargebacks and damages the relationship. The retail partnerships guide covers vendor compliance for chain retailers in more detail.
Protective Packaging for Transit
Products take more abuse during wholesale freight shipping than during parcel shipping to consumers. Pallets slide during truck braking, cases shift when loaded alongside other shippers' freight in LTL trucks, and forklifts occasionally puncture cases with their tines. Protective packaging for wholesale needs to account for these realities.
Inside the case, use dividers, inserts, or void fill to prevent individual products from moving and colliding during transit. Glass and ceramic products need individual wrapping plus cell dividers that isolate each piece. Liquids need absorbent material inside the case in case a bottle leaks. Electronics and fragile items need foam inserts or molded pulp trays that cushion against impact. The general rule is that the product should not move at all inside the case when the case is shaken.
At the pallet level, stretch wrap is your primary protection. Wrap pallets with at least 3 to 4 full rotations of machine-grade stretch wrap, starting from the bottom and working up with overlapping layers. Use corner boards (L-shaped cardboard protectors on the pallet's vertical edges) for pallets shipping lightweight or fragile cases, as corner boards distribute stacking pressure and prevent top-loaded freight from crushing the corner cases. For high-value shipments, add a layer of corrugated sheet between every 2 to 3 layers of cases on the pallet to distribute weight evenly.
Shipping Documentation
Every wholesale shipment needs documentation that travels with the shipment and documentation that goes to the buyer electronically. Physical documentation attached to the shipment includes the bill of lading (BOL) for freight shipments, which is the contract between you and the carrier specifying the shipment contents, origin, destination, and freight terms. The packing slip lists every item in the shipment with SKU, quantity, and case information so the buyer's receiving team can verify the shipment against the purchase order.
Electronic documentation sent to the buyer includes the advance shipping notification (ASN), which tells the buyer that a shipment is on its way with expected arrival date, tracking number, and contents. The commercial invoice specifies the financial terms of the transaction for payment purposes. For international shipments, additional documentation includes customs declarations, certificates of origin, and any product-specific import certificates.
Missing or incorrect documentation causes receiving delays, which cascade into payment delays and buyer frustration. Standardize your documentation process with templates for each document type, and verify every shipment's documentation before it leaves your warehouse. Many B2B ecommerce platforms and order management systems generate packing slips, invoices, and ASNs automatically from order data, which reduces errors and saves significant time compared to manual document preparation.