Two-Bin Kanban System to Cut Inventory in Half

What is a Two-Bin Kanban System to Cut Inventory in Half?

Why it works

The system encodes a proven reorder rule into the bins themselves, so the correct decision is visible to everyone and hard to get wrong.

• The empty bin makes the reorder point obvious, so anyone can act correctly without special knowledge.
• Ordering triggers are standardized instead of depending on one person's counts, removing a common source of error.
• Right-sized bins expose overstock and prevent ordering more than is needed.
• Eliminating cycle counting frees time that added no value to the customer.

Evidence: The warehouse went from ten aisles to about five or six, with inventory reduced roughly by half and less cycle counting and fewer mistakes.

How to create this idea

1. 1
   Pick pilot parts

   Choose a set of frequently used, easy-to-track items to start with.

2. 2
   Set bin quantity

   Size each bin to cover demand during the supplier reorder lead time plus a small safety buffer.

3. 3
   Stage two bins per part

   Place a full and a backup bin so work always pulls from the front bin first.

4. 4
   Make the empty bin the signal

   Define the rule that an empty bin triggers a reorder for that part, no counting required.

5. 5
   Stop cycle counting those parts

   Rely on the bins as the visual control and retire the manual counts they replace.

6. 6
   Review and shrink

   Adjust bin sizes down as confidence grows and reclaim the freed warehouse space.