Orderable Unit Versus Case Pack Versus Inner Pack: How To Choose

Orderable Unit A packaging level or unit configuration that a customer is permitted to order as a single line item. Distinguishing the orderable unit from related concepts such as case pack or inner pack is essential for pricing, inventory control, and store operations.

Retailers and suppliers commonly use several packaging terms that overlap but are not identical. A case pack typically refers to the outer packaging quantity shipped from the supplier; an inner pack is a multipack inside the case; the orderable unit is whichever of those configurations the buyer is allowed (or required) to order on a single PO line.

Key Differences Explained

Understanding the difference prevents operational gaps. The case pack is a logistics reality: it’s how product is packed for transportation and handling efficiency. The inner pack is often consumer‑facing and optimized for shelf selling. The orderable unit is a commercial decision that determines the minimum purchasable quantity and how systems exchange data.

• Case Pack: The number of consumer units in the shipper box or case used for transport and storage.
• Inner Pack: A grouped set of consumer items within a case, like a 6‑pack inside a case of 24.
• Orderable Unit: The pack configuration shown on the PO and used for pricing and inventory receipt.

How To Decide Which Configuration To Expose As Orderable

Choose an orderable unit based on commercial, operational, and technical criteria. Consider store size and selling format, supplier packaging constraints, transportation economics, and the capabilities of both parties’ ordering and WMS/TMS systems. Large omnichannel retailers often accept cases to reduce handling, while grocery or convenience channels may require single units or multipacks.

Example criteria include break‑pack labor cost, forecast granularity, minimum advertised pricing, and the need to track expiration dates at the individual unit level. If the retailer intends to sell single units on the shelf, exposing the single unit as orderable simplifies store replenishment but may increase shipping costs and supplier packaging complexity.

System And Data Considerations

Before locking the orderable unit, confirm system compatibility. EDI transactions, product catalogs (GDSN), and the WMS must represent the same pack level with matching GTINs and conversion factors. If a supplier can only produce and barcode at case level, trying to force single‑unit orderability will create scanning and invoicing problems unless additional barcodes are applied.

• GDSN/GTIN Alignment: Ensure the Global Data Synchronization Network record shows the unit you intend to trade.
• EDI Mapping: Map UOM and GTIN values in the EDI 850/810/856 flows to match the orderable unit.
• WMS Configuration: Set conversion factors so inventory movements translate between orderable units and base units.

Common Commercial Models

Three patterns are common in retail trading:

• Case‑Only Ordering: Retailer orders full cases; DCs handle case breaks if needed for store replenishment. Preferred when transportation cost per unit is key.
• Mixed Ordering: Retailer orders both cases and selected multipacks (e.g., 6‑packs) depending on channel or SKU velocity.
• Each‑Level Ordering: Single consumer units are orderable; common for high‑turn SKUs in small stores or direct‑to‑consumer models.

Practical Example: Selecting A Model

A supplier producing canned coffee may prefer case‑only shipping (24 cans per case) to preserve packaging efficiency. A large supermarket chain with high velocity may accept cases and perform in‑store case breaks. A convenience store chain with lower volume might require 6‑pack orderable units to reduce in‑store handling. Decide by running a cost comparison that includes packaging, transportation, handling labor, and shrink risk.

Best Practices

• Document Agreements: Record the agreed orderable unit, GTIN, and conversion in the trading partner’s onboarding docs.
• Test Transactions: Pilot EDI and ASN exchanges to avoid PO/ASN mismatches on go‑live.
• Review Seasonally: Revisit orderable units for promotions, seasonal assortments, or when new pack options are introduced.

In short, the Orderable Unit is the commercial packing level your trading partners use on purchase orders. Choosing between case pack, inner pack, or single‑unit orderability requires balancing logistics costs, store operations, and master‑data accuracy to prevent downstream friction.