Case Quantity Vs Pack Quantity: Choosing The Right Unit For Shipping And EDI

Case Quantity The number of sellable units contained in a full case. Understanding how case quantity differs from inner-pack or pack quantity matters for labeling, EDI transmissions, and decisions about whether to ship full cases or mixed packs.

Case quantity is the count of sellable items in the outer carton; pack quantity (or inner-pack) refers to how many items are inside a secondary pack within the case. Retailers and carriers often need both numbers: the case quantity for pallet and carton handling, and the pack quantity for shelf-ready merchandising.

Key Differences

• Case Quantity: Number of sellable units in the full case (used for receiving, pallet counts, and case-level GTINs).
• Pack Quantity: Number of units in an inner or retail pack (used for merchandising, piece picking, or display packing).
• Unit Of Measure: Case-level transactions use "case" UoM; retail and piece-level use "each" or "pack" UoM in EDI and inventory systems.

Implications For Shipping And Labeling

Shippers must ensure case-level barcodes (e.g., GTIN-14) correspond to the case quantity declared on labels and ASNs. If a carrier scans a case GTIN expecting 24 units but the case actually contains 12, downstream scans and inventory receipts will be incorrect. Retail routing guides often require explicit case and pack counts on cartons and ASN segments.

EDI And Data Elements To Watch

Common EDI segments carry quantity information at different levels (PO line, cartons, inner pack). Make sure your EDI mappings include:

• Case Count Element: The number of cases shipped for a PO line (used for cartonization and pallet counts).
• Units Per Case Element: The case quantity (sellable units per case) so recipients can calculate total sellable units.
• Inner-Pack Fields: If applicable, send inner-pack quantity so retailers know shelf-ready pack sizes.

Choosing The Right Unit For Fulfillment Strategies

If you fulfill primarily with full-case picks, keep case quantity accurate and prioritize case-level GTINs and labels. For piece-pick or omnichannel operations that frequently break cases, ensure the WMS tracks both case and pack quantities and enforces rules for converting between them when creating picks and adjusting inventory.

Tips For EDI And Label Compliance

• Share Both Counts: Always include units-per-case (case quantity) and inner-pack counts in ASNs and PO confirmations when required by trading partners.
• Label Consistency: Verify that the GTIN on the case label corresponds to the case-level product definition in your product master.
• Test Mappings: Run test EDI transmissions with trading partners to confirm they interpret case and pack quantity fields correctly.
• Document Exceptions: Have a process for mixed-case or variable-pack shipments that cannot be represented by a single case quantity.

In short, the Case Quantity is distinct from inner or pack counts and must be communicated consistently across labels, ASNs, and WMS/ERP records so carriers and trading partners can accurately handle, receive, and merchandise shipments.