A case pack is the carton format Amazon's receiving machinery is built around: one SKU, the same count in every box, and box content data that matches reality. ProShip3PL builds case packs to a fixed spec at our Medley, FL warehouse — loose units in, verified uniform cartons out — so your shipments take the fast lane at check-in instead of the counting table.
Receiving at an Amazon fulfillment center is a throughput game. A shipment where carton 1 provably represents cartons 2 through 200 can be sampled, trusted and shelved. A shipment where every box is a small mystery must be opened, counted and reconciled by hand — and your inventory sits unsellable while that happens.
The gap between those two receptions is built at the packing table, weeks earlier. Case packing means committing each SKU to a spec — a fixed unit count, a carton that carries the weight, a consistent internal layout — and then never deviating. It's unglamorous discipline, which is why loose-packed inventory is so common and slow check-ins with it.
Our floor runs that discipline as a product. Inventory arrives however it arrives — floor-loaded, bulk-bagged, in factory cartons packed to whatever count filled the container — and leaves as uniform case packs: counted at the table, weight-verified as a second check, carton-labeled, with box content data generated from what was actually packed.
The spec itself is engineered once per SKU, balancing Amazon's carton ceilings, board strength against product density, and arithmetic that divides cleanly into your replenishment sizes. After that, every shipment reuses it — which is exactly what makes carton 1 representative of carton 200.
| Spec element | What we fix per SKU |
|---|---|
| Units per case | One number, chosen against carton limits, density and your shipment math |
| Carton | Board grade and size that carry the load without bulging or crushing |
| Internal layout | Orientation and dunnage pattern repeated identically in every box |
| Verification | Table count plus weight check — deviating cartons reopened, never shipped |
| Box content data | Captured from actual packed contents, transmitted with the shipping plan |
| Carton labels | Shipment labels printed here, applied flat on a scannable face |
Units per case, carton grade and layout designed once per SKU — with reasoning you can sanity-check — then held constant across shipments.
Floor-loaded and bulk-bagged inventory counted, screened and packed into uniform cartons — structure added where the factory left none.
Master cartons checked against Amazon's rules and your plan; compliant ones relabeled as-is, offenders repacked — correction, not duplication.
Contents recorded at the packing table and matched to your shipping plan — the declared data and the physical carton always agree.
Shipment carton labels printed on site and placed for a clean first scan; unit FNSKUs applied upstream when the product needs them.
Finished case packs stacked in stable tiers, stretch-wrapped and handed to the carrier — or racked as reserve and released on your trigger.
We propose units per case, carton and layout for each SKU; you approve once and it becomes the standing standard.
Inbound units are counted and visually screened on the way to the table — damaged pieces never enter a case pack.
Cartons packed to spec, count-confirmed, then weighed — any box off the expected weight is reopened before sealing.
Carton labels applied, box content data filed from actual contents, pallets built and released within 24–48 hours.
Nine times out of ten the box content data doesn't match the boxes. We rebuild the shipment as verified case packs with honest declarations — the receiving delay usually disappears with the mismatch.
Container math isn't FBA math. We repack to a deliberate case quantity that clears Amazon's carton ceilings and divides evenly into your shipment sizes — and give the factory the spec for next time.
Dense products fill a carton past the weight ceiling long before they fill its volume. We re-spec to a lower count in a smaller, stronger box — the flags stop and the cartons stop failing at the seams too.
One-off conversions are welcome — no minimums. The pallet gets counted, screened, case-packed to a fresh spec and shipped into FBA as a clean, declared load.
A case pack is a carton containing only one SKU, with the same quantity in every carton of the shipment — say, exactly 24 units of one FNSKU per box, repeated across all boxes. Because every carton is identical, Amazon can scan one carton, apply the count to all of them, and route them through a faster receiving path than mixed cartons get. Uniformity is the entire point: one odd carton demotes the whole shipment's handling.
We work backwards from three constraints: Amazon's carton weight and size ceilings (we track the current thresholds so you don't have to), the strength of the carton with your product's density, and clean math against your replenishment habits — a case quantity that divides evenly into your typical shipment sizes saves rework forever. We'll propose a units-per-case figure with reasoning, and once you approve it, that becomes the standing spec for the SKU.
Box content information tells Amazon what's inside each carton — which FNSKUs and how many — before the carton is opened. Supplied accurately, it lets receiving verify by sampling instead of hand-counting every box. We generate it from actual packed counts, not from what the plan said should be in the box, which is exactly the difference between clean data and the kind Amazon learns to distrust.
When Amazon opens a carton and finds contents that don't match the declared data, that shipment loses its fast path: cartons get manually counted, discrepancies get investigated, and check-in can stretch from days into weeks — with your stock unsellable the whole time. Repeated mismatches also degrade how your future shipments are treated. Our fix is procedural: box content data is captured at the packing table from what actually went in, then scan-verified.
Yes — that conversion is the core of this service. Floor-loaded containers, polybags of bulk units, and factory master cartons packed to arbitrary counts all arrive at our dock and leave as uniform case packs: counted, quality-screened on the way through, packed to your approved spec in fresh cartons, and labeled. Loose inbound, structured outbound.
Each carton gets the Amazon shipment carton label from your shipping plan, placed flat on a scannable face away from seams and edges, plus any handling marks the product needs. If the units inside also require FNSKU labels, those are applied before packing. We print at the warehouse, so a re-planned shipment never waits on labels mailed from you.
Sometimes not — if the factory's cartons are single-SKU, uniform, within Amazon's carton limits and match your shipping plan, we just verify counts and relabel. But factory master cartons are packed for freight efficiency, not FBA rules: overweight boxes, mixed variants, and counts that don't match any plan are common. We audit what arrived and repack only the cartons that need it, so you pay for correction, not duplication.
Then it isn't a case pack — it's a mixed carton, which Amazon accepts but processes on the slower, hand-verified path. Where you sell an assortment, the cleaner move is often making the assortment itself a single listing — see our bundling service — so the carton becomes single-SKU again. We'll tell you which structure fits when we see your catalog; forcing mixed cartons into case-pack clothing is how check-in problems start.
Fixed spec, verified twice. The packing table works from a written spec sheet per SKU — units per case, orientation, dunnage, tape pattern — and each packed carton is count-confirmed and weighed; a carton whose weight deviates from the expected value gets reopened before it ships. The final short carton of a run is never quietly shipped as an exception: it's held for the next run or declared separately, keeping the uniform shipment uniform.
Tell us the product, how it arrives today (loose, bulk bags, factory master cartons), your monthly volume, and any case quantity you already use. Within one business day you'll have per-unit case packing pricing and a proposed spec — units per case, carton size and labeling plan. No setup fee, no monthly minimum.
Tell us the product, how it reaches us today, and your typical shipment size. Within one business day you'll have per-unit case packing pricing and a proposed spec — units per case, carton and labeling plan — ready to approve.
