Packing Station Design: Throughput, Ergonomics and Dunnage

The new pack line looked right on the drawing: twelve identical benches, a printer at each, a roll of bubble wrap hanging from a bar. By the second week of peak, packers were walking to a pallet of flat cartons behind the line, the void-fill hopper ran dry every ninety minutes, and the heaviest orders were being lifted over a lip onto a takeaway conveyor at shoulder height. Output per station was a third below the vendor's brochure figure.

A packing station is a small production cell, and it can be designed with the same arithmetic as any other: a timed task, a station count from peak demand, reach and height limits from published ergonomics guidance, and a consumables supply sized to the hourly burn. Done that way, the line hits its planned units per hour on the first peak and the carton choice stops inflating freight bills.

• What this guide covers: pack task timing, station count, bench layout and height, the heaviest lift, carton and void-fill supply, dimensional weight, ownership of the station standard and a commissioning checklist.
• What it adds: a timed element breakdown, a station-count and bench-stock formula, a NIOSH lifting check, and a worked 12-station line costed in dollars and rupees.

Start from the pack task time, not the bench catalogue

Every decision about the station follows from how long one order takes to pack. Time the task in elements, because each element is changed by a different design choice: carton pre-forming changes one, dunnage dispensing another, label printing a third.

The breakdown below is for a typical small-parcel order of 1.6 units. Times are illustrative; replace them with a stopwatch or video study of at least 30 orders per element on your own line. Add a personal, fatigue and delay allowance, here 15%, to turn observed time into a standard that people can sustain over a shift.

At 61.6 seconds, one packer sustains about 58.4 orders or 93 units an hour. A brochure figure of 120 units an hour usually assumes single-unit orders, pre-formed cartons and no void fill. Before comparing quotes, ask which elements the figure includes.

Counting stations: units per hour, peak factor and utilisation

Size the line for the busiest hour of the busiest planned day, not the daily average. Then hold utilisation below 100%, because a pack line running flat out has no recovery time when a printer jams or a wave arrives early.

Stations needed:
  N = CEILING( O_day / H_day x P / ( R x U ) )

  O_day = orders on the peak planned day          (6,500)
  H_day = productive pack hours in that day        (2 shifts x 7.5 h = 15)
  P     = peak-hour factor, busiest hour / average (1.30)
  R     = standard rate per station, orders/hour   (3,600 / 61.6 = 58.4)
  U     = target utilisation                       (0.85)

  N = CEILING( 6,500 / 15 x 1.30 / (58.4 x 0.85) )
    = CEILING( 563.3 / 49.64 ) = CEILING( 11.35 ) = 12 stations

Bench stock for one carton size:
  S = CEILING( R x U x f x T x (1 + b) )
  f = share of orders using this size (0.40), T = replenishment loop in hours (2.0),
  b = buffer (0.25)  ->  S = CEILING( 49.64 x 0.40 x 2.0 x 1.25 ) = 50 flats

Two checks keep the count honest. Run the formula again with the peak-hour factor from last year's busiest week, not the annual average. Then confirm that upstream picking or a put wall can feed 563 orders an hour; extra benches do not help if totes arrive at 450.

Packing station design for a 6,500-order peak day uses a timed 61.6-second standard cycle, a 1.30 peak-hour factor and 85% utilisation to reach 12 stations; the WMS order release plan must then deliver 563 orders an hour, or the added benches sit idle at the same output.

Bench layout in three reach zones around one standing packer

Lay the bench out so that the packer's hands do the work and the feet stay still. Items used on every order sit within the forearm arc; items used on some orders sit within the full arm reach; anything used less than hourly sits off the bench.

Canada's occupational safety agency, CCOHS, advises organising work so usual operations are within easy reach and avoiding reaches behind the body or above the shoulder line. The zone plan below applies that advice to a pack bench. The positions are a design starting point to be checked with your own packers, not a published standard.

• Primary zone, every order: the tote or inbound chute in front, the scanner, the packing slip printer and the tape dispenser within the forearm arc either side.
• Secondary zone, most orders: pre-formed cartons for the two fastest sizes, the void-fill dispenser outlet and the label printer, within full reach without leaning.
• Tertiary zone, some orders: flat cartons for slower sizes in a rack below or beside the bench, gift inserts, fragile wrap and the reject tote for damaged units.
• Off the bench: pallets of flat cartons, spare tape and label rolls, replenished by a runner on a fixed loop rather than by packers.

Mirror the layout for left-handed packers on at least one bench in every group of six, and keep the takeaway on the same side as the finished carton. A line that forces every packer to turn 90 degrees to place the carton adds an awkward twist to every order and a lifting penalty to the heavy ones.

Bench height, mats and the heaviest lift off the pack line

Bench height should follow the work, and the work at a pack bench changes within the cycle. Fixed benches built for an average packer fit few people well; adjustable benches, or at least two fixed heights per line, cost little and remove most complaints.

CCOHS gives work surface guidance relative to elbow height: about 5 to 10 cm below elbow height for light work, and 20 to 40 cm below for heavy work involving downward force. Scanning and placing items is light work; pressing down to tape a large carton is closer to heavy work. A height-adjustable bench lets each packer set the top for the mix of orders on that line.

The heaviest lift on the line is usually moving a sealed carton from the bench to the takeaway conveyor. The revised NIOSH lifting equation gives a recommended weight limit for that lift, and its lifting index shows whether the station layout or the carton weight needs to change.

A pack bench lift checked with the revised NIOSH lifting equation shows a 12 kg carton twisted 45 degrees onto a rear conveyor gives a lifting index of 1.36; moving the takeaway beside the bench at 25 cm horizontal distance with no twist cuts the index to 0.73, below NIOSH's 1.0 design goal.

Carton sizes, void fill and dunnage replenishment at the bench

Carton and dunnage supply is where most pack lines lose their planned rate. A packer who walks for cartons or waits for fill is idle, and a packer who cannot find the right size picks a bigger one.

• Carton suite: limit the bench to the sizes that cover most orders, with the rest in a shared rack; each size added to every bench costs reach space and replenishment work.
• Pre-formed versus flat: pre-form the two fastest sizes off-line or with an erector, since erecting a flat carton is one of the longest elements in the cycle.
• Void fill choice: paper, air pillows and moulded inserts protect differently; validate the choice with a parcel test such as ISTA 3A, which covers packaged-products of 150 lb (70 kg) or less shipped through parcel delivery systems.
• Replenishment loop: a runner restocks every bench on a fixed loop, using the bench-stock formula above, with a visible minimum line on each carton slot.
• Consumable cost per order: track carton, fill, tape and label cost per shipped order weekly; a rise usually means oversize cartons, not supplier prices.

The trace below shows how a dunnage shortage turns into a freight cost on a peak morning. Order numbers, codes and times are illustrative.

1. 09:40: the paper void-fill hopper at stations 4 to 7 drops below its minimum line; the runner is on the carton loop at the far end of the line.
2. 10:05: stations 4 to 7 run out of fill; packers switch from carton size B to size C and fill the gap with the order's own tissue, using override code OVR-SIZE in the WMS.
3. 10:05 to 11:20: 312 orders, from SO-5581204 onwards, leave in size C cartons whose billed dimensional weight is higher than the planned size B.
4. Two weeks later: the carrier invoice shows a dimensional weight adjustment on those orders, and the freight audit queue flags them against the planned carton.
5. Controlled path: each hopper carries a low-level sensor that calls the runner at 30 minutes of stock, and OVR-SIZE requires a supervisor scan after five uses an hour per bench.

Dimensional weight and why the box choice is a freight decision

Carriers bill the greater of actual weight and dimensional weight, so the carton a packer selects can change the freight charge more than the item inside it. The pack station is where that cost is decided.

The US Postal Service's Domestic Mail Manual, section 223.1.4, applies dimensional weight to Priority Mail parcels to zones 1 to 9 larger than 1,728 cubic inches. For rectangular parcels, the July 2026 revision divides length times width times height in inches by 139 and rounds up. A 14 x 12 x 10 inch carton holds 1,680 cubic inches and bills on actual weight; at 16 x 12 x 10 inches it holds 1,920, or 14 lb for a 4 lb order.

For an Indian parcel at that assumed divisor, a 40 x 30 x 25 cm carton is 30,000 cubic centimetres, or 6.0 kg of volumetric weight for a 2.2 kg order. Dropping to a 35 x 25 x 20 cm carton gives 3.5 kg. How carton recommendations are calculated by a cubing engine is covered in our page on e-commerce cartonization and dimensional weight; this article differs by dealing with the bench where the recommendation is followed or overridden.

A worked 12-station line costed in dollars and rupees

The cost of a pack line splits into station capital, labour per order and consumables per order. The table uses the 12 stations and 61.6-second standard cycle from the earlier sections; all prices and wage rates are illustrative and exclude recoverable sales or goods and services tax.

The last row understates the gain because the freight effect of the smaller carton is usually larger than the carton saving. To see how pack cost sits inside the full fulfilment cost, use the method in warehouse cost per order, which allocates labour, storage and overhead across order types.

Where the WMS decides, and where the packer's judgement stays

The WMS should decide anything that can be checked against data: the carton recommendation, the expected weight and the label. The packer should decide what data cannot see: whether a unit is damaged, whether fragile goods need more protection, and whether the recommended carton physically fits.

The scan and weight controls that stop the wrong item leaving the bench are covered in detail in scan-to-pack verification. The design point for this article is that each control needs bench space and a few seconds of cycle time, so add them to the element study before counting stations.

Pack bench controls in a WMS, such as a carton recommendation from item dimensions and a scale check against expected weight, should be timed into the standard cycle; adding a 3-second weight check to a 61.6-second cycle cuts one station's rate by about 5%, raising peak utilisation on a 12-station line from 80% to 84%.

Who owns the station standard, the carton list and the change

A pack line drifts when nobody owns its standard. Benches get extra shelves, cartons get added, and the timed cycle no longer matches the floor. Name one owner for each part of the design and one approver for any change.

In India, Section 23 of the OSH Code, 2020 lets the Central Government prescribe lighting, space and ventilation conditions for establishments, so the EHS owner should check the rules that apply to the site's State. Neither market has a statute written for pack bench layout.

Commissioning checklist for a new or rebuilt pack line

Commission the line against the design numbers before peak, with real orders and the packers who will run it. Each check below has a pass condition that can be measured in a shift.

A pack line built this way can be extended by adding benches of the same standard, because every number in it is traceable. For more warehouse design and operations guides, see the Logistics and Supply Chain hub. If you are specifying pack station controls in a WMS or planning a new fulfilment line, you can share your requirements with us.