Pre Production vs Final Inspection for Luxury Bags: Three Checks, Three Moments

Three Checks, Three Moments: Where Each One Sits

A luxury bag programme needs three checks rather than one, because the three questions cannot be answered at the same moment. Before cutting, the question is whether the shell, lining, hardware and thread will allow the piece to be made to tolerance at all. At 20-30 per cent complete, the question is whether the bench is holding the approved sample. At 100 per cent packed, the question is whether the lot should be released.

The order matters. A pre production check skipped cannot be recovered by a stricter final one, because by then the shell has been cut into 500 panels and the finding is not a correction but a replacement. Conversely, a final check skipped cannot be recovered by a good pre production one, because materials that were correct at the start do not guarantee 500 pieces made consistently from them.

Pre Production Checklist: What Is Verified Before Cutting

The pre production check is a conformance check, not a sampling plan. It is carried out on the components and the first panels, against the tech pack, and it is the one opportunity to catch a material that will not hold the tolerance. Everything on this list can be verified in under two hours and none of it can be verified later.

• Shell thickness within the specified band: 1.2-1.4 mm structured, 0.9-1.1 mm soft.
• Colour read on a spectrophotometer against the approved standard, held to a delta E of 1.0 or less.
• Finish adhesion to ISO 11644 and tensile strength to ISO 3376 on a sample from the hide lot.
• Hardware plating at 0.15-0.3 µm, with the salt spray result recorded against the lot.
• Zip size and tape reveal as specified: a #5 with a 4 mm reveal on a body opening.
• Thread reference identical to the approved sample, bonded nylon Tex 40 or waxed linen 18/3.
• Lining, interlining of 0.8 mm and base board of 1.5 mm present and correct.
• CITES documentation reconciled with the shell tag where a listed shell is used.

The spectrophotometer reading is the item most often omitted and the one that prevents the commonest dispute. A colour approved by eye under one light can differ measurably under another, and a delta E held to 1.0 or less removes the argument entirely: either the shell is inside the tolerance or it is not.

During Production Checklist: What Is Verified at 20-30 Per Cent

The second check happens when roughly a fifth to a third of the run is complete, which is early enough for a correction to be made on the remaining pieces and late enough for the bench to have settled into its rhythm. It is a comparison rather than a count: the pieces are placed beside the approved sample and read against it.

Readings are taken on five pieces rather than one, because a single piece proves nothing about the run. Where a reading falls outside tolerance, the correction is made at the station that produced it and the piece is compared again the following day, which is the whole reason this check sits at 20-30 per cent rather than at the end.

Final Inspection Checklist: What Is Verified at 100 Per Cent Packed

The final check is the one governed by a sampling plan, and it is taken when the lot is complete and packed, or at least 80 per cent packed with the balance available. Pieces are drawn at random across cartons selected at about the square root of the count, and each is checked in a fixed order so that nothing is skipped.

1. Confirm the carton count and select cartons at the square root of it, rounded up.
2. Draw the sample size for the lot: 50 from 500, 80 from 501-1200, 125 from 1201-3200.
3. Check the exterior: silhouette, panel match, seam lines, edge, hardware and base.
4. Check the interior: lining fit, pocket placement, closure function and any branding application.
5. Count defects by class: critical at zero, major at AQL 2.5, minor at AQL 4.0.
6. Tag and photograph each finding before any re-work begins.
7. Record readings against the order and the colourway, and issue the report.

The fixed order is the discipline. An inspector moving around a piece freely will find what is obvious and miss what requires a deliberate look: the lining slack at the base, the mitre gap at the corner, the feeler test at the plate. A written sequence makes the inspection repeatable between inspectors and comparable between drops.

What Each Check Catches, and What It Cannot

Each check has a blind spot, and knowing them is what makes a programme of three checks worth running. The pre production check cannot tell you whether 500 pieces will be made consistently, because it examines materials rather than output. The during production check cannot tell you whether the last third of the run drifted, because two thirds of it had not been made when it was taken.

The final check cannot tell you why anything happened. It produces a count and a decision, which is enough to protect a shipment, but the cause has to be found at the station, which is why the during production check is the one that actually improves the next drop. Run together, the three cover each other's blind spots; run alone, any one of them leaves a gap a season can fall through.

Sample Sizes and Standards at Each Stage

Pre production basis

Tech pack conformance, no AQL applied

During production pieces

5 pieces read against the approved sample

Final basis

AQL 2.5, ISO 2859-1, general level II

Sample from 281-500

50 pieces, accept 3, reject 4

Sample from 501-1200

80 pieces, accept 5, reject 6

Sample from 1201-3200

125 pieces, accept 7, reject 8

Critical defects

Zero acceptance at any stage

Minor defects

AQL 4.0, accept 5 and reject 6 at 50 pieces

Material tests

ISO 3376, ISO 11644, ISO 105

Transit test

ISTA drop and vibration sequence

Note that the pre production stage deliberately applies no AQL. Sampling theory assumes a stream of comparable units produced by a stable process, and at the point before cutting there is no stream yet, only components. What applies instead is conformance: each item either matches the tech pack or it does not.

Cartons, Packing and the Drop Test

The final check includes the packing, because a piece that survives the bench and fails the journey is still a return. Cartons are specified as 5-ply with a stated edge crush value, typically 32 ECT, each piece is bagged and separated so hardware cannot mark an adjacent panel, and the carton is filled so that it cannot shift when lifted.

• 5-ply carton at a stated edge crush value, typically 32 ECT.
• Each piece bagged, with tissue between hardware and any adjacent panel.
• No void left in the carton; fill with paper rather than leaving a gap to shift in.
• Carton weight held under about 15 kg so it is lifted rather than dragged.
• Transit tested to an ISTA drop and vibration sequence before the first shipment.

The transit test is worth running once per packaging specification rather than once per shipment. Nine pieces out of ten arrive damaged because of a void in the carton or a strap placed over a corner, and both are found by a single drop and vibration sequence run before the season rather than by inspecting harder afterwards.

Cost and Schedule: What Three Checks Add

Three checks add inspection time and, on a designer programme, roughly USD 4.80 per unit across the run once the re-work reserve is included. Against that sits the cost of a finding at the destination: air replacement on the affected pieces, returns handling, and the sell-through lost while shelves wait for a 30-35 day sea schedule to be beaten by air.

The programme runs through our validated partner factory Quanzhou Yingming Bags, an SGS-validated site with 7 production lines and about 200,000 pcs per month of capacity, holding export experience since 2014. Sampling takes 6-10 working days, or 12-15 on a complex build; bulk occupies 35-50 days; minimums sit at 500 pcs per style and colourway; and shipments leave FOB Xiamen with FOB, CIF and DDP terms available.

Choosing Which Checks Your Programme Needs

Not every programme needs all three at full strength. A first drop in a new material wants all three, because nothing is yet known about how the shell behaves on a run. A repeat colourway of an established style can move to a pre production check plus a final one, because the middle check has already told you what the bench does with this piece.

An exotic programme reverses the emphasis: the pre production check becomes the most important of the three, because a shell with tile matching within 3 mm across a centre line and permanent stitch holes cannot be corrected once cut, and a reserve of 2-3 per cent above the run quantity becomes essential rather than prudent. Where a shell is listed, CITES documentation is reconciled with the tag before any panel is released.

A full change of material sits in the same category as a first drop even when the style is unchanged. A new tannery, a new finish or a new hardware plating bath reintroduces every unknown the first pre production check was designed to remove, and the cost of running all three checks once more is small against the cost of discovering the difference at the final draw.

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