Lot Number

What Is a Lot Number?

A lot number, also called a batch number, is a code that identifies a group of products produced under the same conditions, usually in the same production run. It is printed on the product label, the packaging or the shipping carton.

All units in a lot share the same number. That makes it possible to connect a finished product back to the ingredients, date and equipment used to make it.

How It Works

The manufacturer assigns the lot number at production. Formats vary. Some include the production date, some include a facility code and some are simple sequential numbers. For example, L2410-07 might mean the seventh batch made in October 2024.

When the goods arrive at a warehouse, the lot number is recorded alongside the SKU during receiving. From there, the warehouse can track how many units of each lot are on hand, where they are stored and which orders they shipped in. Lot numbers often travel with an expiration date, which is used for first-expired, first-out picking.

• Print the lot number on every unit and every master carton.
• Include it on your advance shipping notice.
• Keep each lot separate when packing inbound shipments.

Why It Matters for Ecommerce Brands

Lot numbers turn a general product problem into a specific, manageable one. If a customer reports an issue, the lot number on their package tells you which batch it came from. If a supplier flags a defect, you know exactly which inventory to quarantine.

For ecommerce brands in regulated or sensitive categories like supplements, cosmetics and food, consistent lot numbers on every unit and carton make receiving faster and traceability reliable. Ask your manufacturer to print lot numbers clearly and to note them on your shipping documents.