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SKU Slotting and Rack-Space ROI — Which Items Earn Their Location

The storage decision that determines whether a conversion pays for itself is not which system you buy. It is which SKUs go into it. Here is the method, the arithmetic, and the mistakes that cost location count.

Clear Storeganizer pockets with label holders creating high-density pick faces in pallet rack

3

properties that decide slotting

up to 396

locations per bay

2–3

pocket sizes per bay is normal

44 lb

per pocket limit

The problemThe modelThe arithmeticSizing methodMistakesWorked exampleRe-slottingFAQs

Why locations, not square feet, are the unit that matters

Warehouse capacity is almost always discussed in area or in pallet positions, and for pallets that works. For small parts it hides the actual constraint. A parts room does not run out of square feet; it runs out of addresses — distinct places to put a distinct SKU so that a picker can find it without searching. That is why a building can look half empty and still be full, and why adding shelving to a crowded parts room often makes picking slower rather than faster.

Once you count addresses instead of area, the arithmetic changes. A pallet position holding a mixed pallet of small parts is one address for many SKUs. A shelf level is one address per SKU but sized for a case. A column of right-sized pockets is one address per SKU sized to the SKU. Same bay, three very different answers.

Diagram comparing pick locations in one pallet rack bay as pallet storage, shelf levels and Storeganizer pocket columns
The same bay counted in addresses rather than area: three, sixteen, or up to several hundred.

The slotting model: size, stock volume, order frequency

Slotting diagram plotting SKU size, stock volume and order frequency to show which items suit Storeganizer pockets
Small items with modest stock depth suit pocket columns at any order frequency. Bulky items and deep holdings stay in rack.

Read the three axes separately

SKU size is a hard constraint. It decides whether a pocket can physically hold the item, and which of the five standard sizes applies.

Stock volume decides how much of the inventory lives in the pocket. Low depth: all of it. High depth: the pick face only, with bulk stock behind or above.

Order frequency is the axis most people misread. It does not determine whether pockets suit the part. It determines placement — which bays, how close to packing, how the pick route runs. Fast and slow movers both belong in pockets if they are small.

The one-line test

If the location currently holding an item is substantially larger than the item, and the item weighs less than 44 lb, it is a candidate. Everything else in the analysis is refinement.

The arithmetic that makes the business case

Two numbers carry almost all of the decision. Both can be produced in an afternoon.

Number How to get it What it tells you
Locations per bay, before Count the discrete pick addresses in one representative bay today Your current address density
Locations per bay, after Configure the same bay with appropriate pocket sizes Your potential address density
Bays required, before / after Total small-part SKUs divided by each figure How many bays you get back
Cost of the alternative Rent, fit-out and racking for the space you would otherwise add What the conversion is actually competing against
Diagram comparing 3 storage locations in a pallet position with 42 locations in Storeganizer pocket columns
One pallet footprint, addressed at pallet scale and at item scale.

The Storeganizer Designer returns the “after” number for any bay dimensions and pocket size you enter, which is usually the fastest way to get from a hunch to a figure. For the full cost comparison against leasing space, see Storeganizer cost and ROI.

How to size a pocket without guessing

1

Group the SKUs

Group by physical similarity, not by product family. A fitting and a fastener that are the same size belong in the same group even if the catalogue separates them.

2

Measure the largest in the group

Not the average. A pocket sized to the average will not close around the outlier, and the outlier is the SKU that ends up back on a shelf.

3

Add handling clearance

Roughly an inch in each direction so an operator can get a hand in and a part out without fighting the opening.

4

Check weight before volume

44 lb per pocket, 220 lb per column. Dense parts — fasteners, fittings, castings — hit the weight limit while the pocket still looks half empty.

When a divider beats a smaller pocket

For very small, low-volume SKUs, a divider inside a standard pocket creates two addresses without adding another pocket size to the configuration. That keeps the bill of materials simple, and the divider comes out again if stock depth grows. Front stops do the same job for items that would otherwise roll or slide forward at the pick face.

Diagram of the five standard US Storeganizer pocket sizes XS to XL with opening dimensions and pick locations per 96 inch bay
The five standard US pocket sizes with pick-location counts per 96″ bay. Custom dimensions are available where a part will not cooperate.

Four slotting mistakes that cost location count

1️⃣

One pocket size for everything

The most expensive mistake. Half the intended SKUs will not fit, they go back onto shelving, and the location count you bought never materialises.

2️⃣

Sizing to the average item

Same failure, arrived at more subtly. Always size to the largest item in the group.

3️⃣

Ignoring weight

A pocket sized correctly by volume can still be over its 44 lb limit. Check dense parts first, not last.

4️⃣

Slotting by catalogue, not by geometry

Product families group items by what they do. Pockets group them by how big they are. Slot on the second.

What this looks like in practice

Two reference installations show the method applied rather than described. Both mixed pocket sizes deliberately, and both reported the location count as the headline outcome:

Operation Slotting approach Reported outcome
Everten Supplies, online kitchenware 18 bays combining small, medium and large pockets 2,759 storage locations in 50 m²; that footprint went from holding 10% to 25% of stock lines
CEVA Logistics, 3PL contract site 26 bays fitted with five distinct pocket sizes A wide SKU range consolidated from across a 90,000 sq ft site; picking accuracy reported at 100%

Neither of those results came from a single compromise size. That is the pattern worth copying. Full write-ups: Everten and CEVA Logistics.

Slotting is not a one-time exercise

Every slotting plan starts decaying the day it is implemented, because the SKU base moves. Lines get added, volumes shift, seasonal items arrive and leave, and a part that justified a large pocket last year now ships in half the quantity. In a shelving installation that drift is expensive to correct — you are moving steel. In a pocket system it is not, and that is a genuine operational advantage rather than a marketing one.

What to review, and how often

  • Quarterly: placement. Which pockets are being picked most, and are those bays the closest ones to packing? Moving a column is a two-minute job.
  • Twice a year: pocket fit. Look for pockets running consistently empty (oversized) or being replenished daily (undersized, or they should be a forward pick face with bulk behind).
  • Annually: the boundary. Which items have grown out of pockets and belong back in rack, and which rack items have shrunk into pocket territory?
  • On any range change. An acquisition or a new product line is the moment to re-slot, not six months later.
Order picker selecting parts from Storeganizer pocket columns with a picking cart
Pick frequency tells you where a column should sit; pocket fill tells you whether the size is still right.

This is also why the reversibility of the system matters at purchase time. A configuration that can be re-slotted, extended a bay at a time, or lifted out and rehung in another building is worth more over ten years than a marginally cheaper installation that is fixed in place. If you are weighing that trade-off, the comparison against shelving, bins, flow rack, carousels and VLMs sets out where each option genuinely wins.

Slotting and rack ROI — FAQs

How do I decide which SKUs go into Storeganizer pockets?
Three properties settle it: item size, stock volume held, and order frequency. Size and stock volume determine whether a pocket can hold the item. Order frequency determines where in the building the bay should sit, not whether pockets suit the part. Small items with modest stock depth belong in pockets at any order frequency.
What is rack-space ROI?
The return you get from a given volume of rack. Measured as discrete pick locations per bay, a bay of pallets holding small parts might offer three; the same bay converted to pocket columns can offer several hundred. The ratio between those two numbers, applied to the bays you would otherwise have to add or lease, is the business case.
Should I use one pocket size or several?
Almost always several. A single size forces every SKU into the same compromise, and the items that will not fit go back onto shelving — which is the most common reason a pocket installation underdelivers. Mixing two or three sizes in one bay is normal; one reference installation used five.
How do I size a pocket correctly?
Take the largest item in the group, not the typical one. Add roughly an inch of handling clearance in each direction. Then check weight: up to 44 lb (20 kg) per pocket, and dense small parts reach that limit long before they fill the volume.
What if I hold deep stock of a small item?
Split it. Put the pick face in a pocket and the replenishment stock on a pallet above or behind. The pocket becomes a forward pick location rather than the entire inventory for that SKU.
Does slotting analysis cost anything?
No. We run the SKU profile and the location arithmetic as part of quoting a system, and we will tell you if the answer is that a conversion is not worth doing.

Let us run the slotting analysis

Send a SKU list and a bay measurement. We will come back with pocket sizes, a location count, and the bays you would get back.

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