Apparel · Case Study
How We Cut Apparel Shipping Damage by 28% With Less Paper, Not More
Bamford, a mid-market apparel brand, shipped its whole range in one oversized kraft mailer. Conveyor belts punctured it, moisture finished it, and 40% of every bag was empty air the brand paid to fly. The fix was a narrower bag and a lighter sheet.
Sizing the mailer to the garment, not the range 
The redesigned mailer, two inches narrower 
Six months of damage logs, read on the fulfillment floor
The Result, Up Front
- −28%
- Shipping damagemeasured over three months
- −15%
- Dimensional volumeper parcel
- <5%
- Void space leftdown from 40%
- $0.38
- Cost per unitat the 10,000-unit tier
- Client
- Bamford
- Industry
- Apparel
- Brief
- 90 GSM FSC recycled mailer
- Order
- 10,000-unit production tier
- Timeline
- Three months to the result
01 · The Challenge
One Mailer, Sized for Nothing in Particular
The brand shipped all apparel in a single generic kraft mailer. It was sized for the heaviest item in the range and used for everything, so most parcels carried more air than garment.
On the conveyor that showed up as puncture damage, moisture ingress and scuffing — and a barcode that would not reliably read.
Forty percent of the bag was empty
A void-space measurement on the standard medium mailer came back at 40%. The garment travelled inside it for the whole journey, and internal movement is what scratches and creases on arrival.
A label on a surface that will not hold it
Scanners failed to read the barcode with the regularity you would expect on a wrinkled, uneven mailer, and mandated warning labels peeled off the same surface.
The seal flap failed four times in a hundred
The sealing flap gave on 4% of parcels, and each failure cost more than the bag. Uncoated recycled kraft absorbs warehouse humidity, which weakens the seal further.
Fifteen hours a week spent re-packing
Warehouse staff spent 15 hours every week repacking damaged shipments. Freight was billed on dimensional weight, so the empty space was paid for twice.
This recycled kraft substrate absorbs ink unevenly. The dark blue logo looks faded and rubs off on the sorting conveyor.
02 · What We Changed
Less Paper, Sized Correctly
The obvious answer was a heavier bag. The one that worked was a narrower one: the mailer came in by two inches, the sheet dropped from 120 GSM to 90, and the adhesive was re-specified for the material it was actually sealing.
Take two inches out of the width
The mailer came down by two inches. That one change removed the internal travel behind the scuffing, and it cut the dimensional weight with it.
Drop the sheet weight, keep the strength
A 90 GSM FSC-certified recycled kraft replaced the heavier stock. A right-sized 90 GSM mailer outperforms an oversized 120 GSM one, because the garment is no longer moving inside it.
Match the adhesive to the paper
Three glue viscosities were tested before a high-tack cross-linked hot melt was specified. An uncoated recycled surface takes on ambient moisture, and a standard glue lets go when it does.
Keep the ink away from the edges
Heavy ink coverage was pulled back to the centre of the mailer. Barcodes and warning panels sit on a flat, unprinted zone, and the edges carry nothing for a conveyor to rub off.
The Gated Sequence
Five Gates, Each With a Release Condition
Gate 1
Read the logs, not the sample
Released after six months of damage records and two weeks on the fulfillment floor, with packers watched rather than interviewed.
Fulfillment audit
Gate 2
Lock the specification
Released when paper weight, width and adhesive grade were written down, before the first press proof.
Gate 3
Prove the colour holds
Released once ink density was raised 12% and a calendering step smoothed the sheet. Shade drift stopped, and the print stopped rubbing off.
Press
Gate 4
Seal it in humidity
Released on the seal test alone. A closure that passes in a dry room and fails in a damp transit hub has not passed.
Quality control
Gate 5
Run the pilot first
Released on a 500-unit pilot through the same line. Nothing ships at volume until a small batch has survived it.
Production
Recycled kraft takes on moisture, and a seal specified for virgin stock lets go when it does. The adhesive has to be chosen for the substrate, not for the machine it runs on.
03 · What the Numbers Say
The Number, and How to Verify It
The headline claim is a 28% cut in shipping damage, achieved with a lighter sheet. The table below is the whole of it.
| What moved | Before | After | How it was measured |
|---|---|---|---|
| Shipping damage | 4% seal failures, plus puncture | 1.2% overall defect rate | Damage records from the six months before, then a 500-order audit |
| Void space | 40% of the mailer | Under 5% | Measured against the garment range, not one SKU |
| Material per unit | 102 grams | 90 grams | Weighed on the production line |
| Parcel dimensions | 12 × 15 inches | 10 × 13 inches | Measured flat at the packing bench |
| Cost per unit | $0.45 | $0.38 | Verified at the 10,000-unit production tier |
The damage figure comes from the fulfillment logs kept before the rebuild and the same records three months after. Void space and material weight were measured on the line, and the unit cost was taken off the production invoice rather than a sample quotation.
Since we synchronized the folding sequence with the new mailer dimensions, my team doubled our hourly pack-out rate. We spend zero time taping down loose corners or double-bagging fragile items.
04 · What to Demand Next Time
Four Questions Worth Asking Before You Re-Spec a Mailer
The instinct is to buy a thicker bag. These four questions are what stops that instinct from costing you the saving it was meant to make.
Test the closure, not just the sheet
Ask which adhesive grade is specified and whether it was tested on the actual substrate. A recycled surface that takes on moisture defeats a glue chosen for virgin stock.
Measure void space across the range
Forty percent of a mailer is invisible on a spec sheet. Ask for the measurement taken across the garments the bag really ships, not the one it was designed around.
Put the barcode on a flat zone
A scan failure on a receiving dock rejects an entire pallet. Specify an unprinted, unwrinkled panel for the label, and hold the ink back from it.
Count the minutes, not the grams
A lighter mailer that takes longer to pack is not cheaper. Ask what the pack-out rate was before and after, on the same line.
A specification is a test plan. A pack with a 36-inch drop requirement, a seal-strength test and a colour tolerance has a specification; a description of how it should look is a wish.
Sending Air Is Not Free
Send us the mailer and the damage it is causing. The reply names the width to cut, the grade to drop, and the adhesive to change.
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