What a Crowded Warehouse Taught Us About Flow
By the spring of 2021, a regional distributor we worked with had survived a brutal year. Demand had whipsawed through the pandemic, suppliers had been unreliable, and the team had spent months just keeping shelves stocked. When things steadied, leadership finally had room to ask a harder question: why did it still take so long to get an order out the door? The building wasn't full. The people weren't lazy. And yet throughput lagged. This is an anonymized account of what we found and what changed.
The symptom everyone could feel
Pickers were exhausted by mid-afternoon. A simple walk-through with a stopwatch told the story: a single multi-line order had a picker crossing the floor four or five times, doubling back past aisles they had already visited. The fast-moving items — the twenty SKUs that made up most of every order — were scattered across the warehouse, some near the dock, some in the far corner where they had landed during a frantic restock months earlier. Nobody had moved them back. Travel time, not picking time, was the real cost.
We measured it. Roughly 60 percent of each pick cycle was walking. That is not unusual — travel is consistently one of the largest components of order-picking labour — but it is fixable, and it rarely requires a bigger building.
What we changed, and in what order
Slot by velocity, not by category. We pulled six months of order lines and ranked SKUs by pick frequency. The top movers were relocated to the golden zone — waist-to-shoulder height, closest to packing and shipping. Slow movers went up high and to the back. Categories felt tidy on paper, but velocity is what your feet actually pay for.
Shorten and straighten the path. We laid out a logical pick route that flowed in one direction from receiving toward shipping, so an order was assembled in a single pass instead of a scavenger hunt. Where the floor allowed, we widened the main travel aisle and narrowed low-traffic ones.
Separate reserve from forward pick. Bulk pallets were moved to a reserve area and used to replenish smaller, easy-to-reach forward-pick locations. Pickers stopped climbing and stopped waiting for a forklift to bring a pallet down mid-order.
Make replenishment a scheduled job. Empty forward locations had been the silent killer. We set min/max levels and assigned replenishment to off-peak hours so the line was never starved during the morning rush.
The result, and the lesson
Within two months, average travel per order dropped by nearly a third, and the same crew was shipping more without overtime. No new racking, no expansion — just product placed where the work actually happened.
The broader lesson held up well in a disrupted, hybrid-staffed environment: when volumes are volatile and you cannot count on a full team every day, a layout that minimizes wasted motion is a buffer against chaos. Flow is designed, not inherited. Walk your floor with a stopwatch before you ever talk about square footage.
Rank SKUs by pick frequency before assigning locations
Put fast movers in the golden zone, close to packing
Route picks in one direction to avoid backtracking
Schedule replenishment so forward locations are never empty
If your supply chain is straining under disruption and you want a clear-eyed look at how goods, contracts and suppliers actually flow, XNM's procurement, sourcing & contract management can help you turn day-to-day firefighting into a system that holds.