Multipicking, batch picking, zone picking — order fulfillment strategies

One order, one picker, one route. Walks through the warehouse with a basket or cart, collects the lines, ends at packing. The basis everyone knows. Throughput: 60-80 order lines per hour with classic shelving and small items.

Single picking makes sense when:

• orders are large (15+ lines each) - the operator walks the whole warehouse anyway, combining several gives no gain
• the warehouse is small (under 500 sqm) - routes are short, walking cost is low
• few SKUs, high average lines per order - typical B2B with pallets

The moment the order has 1-3 lines, like in typical e-commerce, single picking burns 80% of the time on walking. That's when you need something faster.

The operator gets a cart with several totes - typically 6, 8 or 10 - and one route optimised by the WMS. While walking, they collect items into the totes: this one to tote 1, that one to tote 4, the next to tote 7. The WMS guides them along the shortest path covering all lines of all orders.

Requirements:

• mobile terminal or ring scanner with a screen showing the tote number
• a WMS that optimises a route across many orders (Weaver does it natively)
• totes clearly labelled - by colour, number, sometimes an additional pick-by-light display
• a consolidation or packing zone where totes are split back into orders

Throughput: 150-200 lines/h for small items. Twice as much as single picking, because the operator covers an area once instead of looping through it several times.

Here the batch isn't split between orders during picking. The operator gets a list: 50 pieces of SKU A, 30 of SKU B, 12 of SKU C. They walk and pick the full requested quantity of each SKU into one big tote or cart. Sorting into orders happens only at a sortation table or on an automated sorter.

Batch picking is the fastest way to collect items if orders strongly repeat. Typical e-commerce with small cosmetics, where 80% of orders are 5-10 of the same SKUs - batch with sortation gets 250+ lines/h. The operator doesn't think "for which order", just "take 50 pieces and move to the next location".

The price: you need a separate sortation station. Manual (a rack with totes labelled by order numbers, two people sorting), semi-automated (put-to-light - lamps show which tote to drop the next piece into) or fully automated (a carousel sorter, we've seen one at a customer with 8000 orders/day).

A wave is a portion of orders processed in one window. Most often we split them by carrier or shipping time. At 9:00 the "DPD - 12:00 pickup" wave starts, at 11:00 the "InPost - 14:00 pickup" wave, at 13:00 the "GLS - 16:00 pickup" wave. Within each wave, orders are picked together, packed together, and reach the loading area in sync with the carrier's arrival.

Wave picking isn't a separate picking method - it's a way of organising time. Inside a wave you still apply single, multi or batch picking. The point: control when parcels are ready, so the carrier doesn't wait but packing doesn't pile up at once. It's a production-flow question, not a warehouse one.

It makes sense for warehouses shipping two or three times a day with different carriers. In a single-batch scenario (one carrier at 17:00), waves give nothing.

We split the warehouse into zones - typically 4-8 - and each picker has their own. Inside the zone they pick lines from every order touching that zone and pass the tote on (by conveyor, cart, manual). Consolidation at packing pulls all totes of a given order back together.

Zone picking has three big advantages:

• the picker knows their zone by heart - they don't read labels, they walk by reflex
• no jamming in one aisle, because each picker has their own area
• easy to scale - add a picker to the zone that has more work

The drawback is consolidation delay - the order isn't ready until the slowest zone finishes. One picker in the chemicals zone slows down 30 orders if the printer breaks. That's why zone picking usually pairs with time synchronisation or a consolidation buffer.

Pick-then-pack: the whole order is picked first, then taken to a separate packing station. The packer focuses on packing - choosing a box, placing items, printing the label. Packers are the bottleneck, but they're fast at what they do. On average 30-60 parcels/h per person.

Pick-and-pack: the picker packs as they go, or at a station at the end of the route. Shorter chain, fewer hand-offs, but the picker loses rhythm to unfolding the box, taping, labelling. Makes sense at low volumes (up to 200-300 orders/day) and for high-value orders, where one person owning the order from start to finish is a plus.

Above 500 orders/day, pick-then-pack always wins. Specialised stations simply give higher throughput than universal ones.

In large operations we rarely see a "pure" single strategy. A typical setup with 2000-5000 orders/day looks like this:

• warehouse split into 4-6 zones (zone)
• in each zone pickers collect in multi mode (several orders at once)
• totes from different zones consolidate at put-walls or on a conveyor
• everything organised in waves synchronised with carrier pickups

It sounds complicated, but in practice each element does something different: zone reduces walking time, multi reduces the number of passes, wave controls when the parcel is ready. Together they give throughput no single scheme can.

From our deployments, the data looks roughly like this (small items, on average 3 lines per order):

• Single picking: 60-80 lines/h
• Multipicking (8 orders): 150-200 lines/h
• Batch picking + manual sortation: 200-250 lines/h
• Batch picking + put-to-light: 250-350 lines/h
• Zone + multi with consolidation: 180-220 lines/h per picker in the zone

These numbers assume a properly tuned topology (A-class items closer, C further), trained operators and equipment that doesn't slow them down. The first month after go-live, throughput is usually 60-70% of the target - operators are learning, we're tweaking the configuration.

Strategy is the idea, equipment is the execution. The list of things that genuinely push throughput:

• Picking cart with 8-12 totes - typically EUR 350-800, gives multipicking out of the box
• Ring scanner (finger scanner, Bluetooth-paired with a wrist or belt terminal) - EUR 350-600 each. Frees both hands - the operator doesn't reach for the scanner, it's always ready. In our measurements +15-20% speed.
• Pick-by-light - lamps at the totes showing which one to drop into and how many. Eliminates multipicking sorting mistakes, raises speed. Around EUR 50-100 per tote plus a controller.
• Voice picking - headphones, microphone, speech synthesis. The WMS says "location A05.03, take 12 pieces", the operator confirms by voice. Hands-free, eyes on the goods. Standard at large 3PLs (DHL, GLS cross-docks). EUR 1000-1500 per kit plus the WMS licence.
• Put-to-light at sortation - lamps showing which tote to drop the next batch piece into. Without it, manual sortation eats the batch picking gain.

Roughly:

• Small warehouse, up to 200 orders/day, B2B with large lines: single picking, possibly pick-and-pack
• E-commerce, 200-1000 orders/day, small items, on average 2-4 lines: multipicking with carts
• E-commerce, 1000-3000 orders, strongly repeating SKUs: batch picking with put-to-light sortation
• Warehouse above 3000 orders, large area, many carriers: hybrid - zone + multi + wave
• Industry with seasonality (5x peak): zone picking - you easily add pickers to the busiest zones without rebuilding the rest of the operation
• High-value goods, low volume, high responsibility for errors: pick-and-pack - one person picks and packs, easy to trace mistakes

A WMS without support for different strategies is just a database with item codes. A real WMS has to:

• group orders into batches by rules (carrier, carrier zone, shipping time, order profile)
• optimise the picker's route with multipicking in mind (shortest path through all locations of all orders, not just one)
• handle multi-zone consolidation
• integrate with equipment - voice, pick-by-light, ring scanners, terminals
• report throughput per strategy per picker, so the bottleneck is visible

In Weaver WMS all these strategies are available natively - you switch between them by configuration, you don't need separate modules or external add-ons. What's more, you can mix them - some order groups in batch, others in multi, one zone in zone picking, another in pick-and-pack. What works best for a given operation, we settle in the pre-implementation analysis and fine-tune in the first weeks after go-live.

The picking strategy choice is rarely a one-off. The warehouse grows, the order profile changes, new carriers come on board - and what was optimal two years ago no longer is. From our perspective the most important thing is that the WMS lets you change strategies without rebuilding the system from scratch. Then deciding "should we try batching" takes a week, not half a year.