Price the Stock Program Before You Right-Size the Box

The Proposal Arrives With One Number On It

A right-size case for a bulk container usually shows up as a cube calculation. The new size holds the actual fill rather than the fill the box was drawn for years ago, the unit price drops, and the annual saving is that delta times last year's volume. In late October I walked a bulk packaging supplier's program with its commercial lead and found a live right-size question on an existing client where that case would have been priced wrong, for a reason that was not in the price column.

The current size was a stocked standard. The proposed size was not. That is the actual decision, and it is not whether the smaller box is cheaper per unit.

What A Stock Program Sells You Besides The Box

A supplier holding pre-built inventory against a standard size is selling two things and quoting one. The first is the container. The second is a buffer it finances, stores and replenishes against a forecast you help build but do not have to hit. In the program I reviewed, that buffer reads on the quote as a lead time of three to four days, because the order is a draw from floor stock rather than a production run.

The supplier's own commercial logic is to move customers out of custom, and the reason is arithmetic rather than sales position. A customer specific print, size or design each break the pooling that makes floor stock possible, because nothing can be prebuilt against several customers at once when each one wants a different part. Pooled demand needs less safety stock than the same demand split across unique part numbers.

Right-sizing into a unique size moves that arithmetic onto your balance sheet. Exposure to forecast error transfers from the supplier to you. Replenishment stops being a draw and becomes a build. And a short changes character: an expedite on a stocked part is a freight cost, while a short on a built part can stop a pack station, because a bulk container is usually not substitutable at the point of fill the way a label or a case sometimes is.

Price The Buffer Before You Price The Cube

Here is deliberately hypothetical arithmetic, written to show the shape of the calculation rather than to recommend an operating condition or a rate.

A plant consumes 40,000 bulk containers a year, roughly 770 a week. The stocked standard quotes three days, so the plant holds about one week of cover. A right-size drops the unit price by $0.45, which is $18,000 a year on that volume. The custom size quotes a four week build and a minimum run of 10,000 units.

Three lines move. Cover has to rise from one week to at least five to survive the build cycle plus the reorder decision, so roughly 3,850 units instead of 770. At a hypothetical $14 landed per container, that is about $43,000 of additional inventory financed and stored. The minimum run then forces an order quantity near thirteen weeks of use, so average inventory sits higher again than the cover calculation alone implies. And the first order is placed against a forecast, so a fill change or a SKU exit inside the build window strands units in a part number no other customer can absorb.

Under those hypothetical figures the $18,000 is not a saving. It is a $43,000 working capital decision carrying an $18,000 annual return and a new line stop exposure. The figures demonstrate the arithmetic and are not a benchmark.

My rule at that volume is the one that sounds least ambitious: fewest unique parts, drawn from stock, beats a smaller box. The smaller box wins when volume is high enough that the part was going onto a dedicated build regardless. At that point the pooling was never yours to lose, and the cube saving is real.

The Column Nobody Owns

The right-size decision needs one person who sees both columns, unit price and weeks of cover. In most mid-market plants those columns sit with different people, purchasing and materials planning, and the case gets approved by the one who only sees the first. That split is the structural failure, not the box.

Fixing it is a document change, not a reorganization. Require the supplier to state the source condition in writing for both sizes, stocked or built, with the quoted lead time and minimum run quantity on the same page as the price. Require planning to state the cover it will hold at the new lead time. Net the carrying cost delta against the price delta before the number enters a savings tracker at all.

Then verify in the only place the answer shows up. A negotiated price delta is not a saving, an implemented spec change is not a verified result, and the result is not verified until two things hold for twelve months: the carrying cost delta came in at or under the estimate, and container shorts that stopped a pack station stayed at zero. Count those stops by line, by part number, and keep counting after the transition closes.

What The Well Run Version Reads

Every bulk container on the spec list carries four values in writing: whether it ships from supplier floor stock or from a build, the quoted lead time in days, the minimum run quantity, and the weeks of cover held on site. A size, print or design change is approved only when all four are restated for the new part and the carrying cost delta is netted into the saving. Pack station stops caused by a container short are counted by line and reviewed monthly, at zero. Nobody has to ask purchasing which parts are stocked, because the answer sits on the spec next to the dimensions.

The Test To Run This Week

Take the three highest volume bulk containers on your spec list. Ask the supplier one question about each: does this ship from your floor stock, and what is the quoted lead time. Ask your planner how many weeks of cover is held on each. If a part is built rather than stocked and the cover does not clear the build cycle, you are financing a gap you believe somebody else owns, and that gap is the first number the next right-size case has to clear.