What to Expect When You Ship a Container to a 3PL Warehouse
Shipping your first ocean container to a third-party logistics (3PL) warehouse involves more than booking a truck. The paperwork you send ahead, how the container is loaded and when it arrives all decide how fast your inventory is received and how much the move really costs. This guide walks through the process from the port to the shelf, so you know what your warehouse needs and where delays usually come from.
1. Before the container ships
Send the documents your warehouse needs
Your 3PL can only receive what it can check against paperwork. Before the container leaves the origin port, share:
- Packing list: every SKU, the carton count per SKU, units per carton, and carton weights and dimensions.
- Commercial invoice and bill of lading: needed by your customs broker and for any claim if something is lost or damaged.
- Advance ship notice (ASN): the warehouse’s own receiving document, listing what is arriving, the container number, the estimated arrival date and any lot codes or expiration dates it must capture.
- Special handling notes: fragile or heavy items, stacking limits, and any product that must be kept apart from other goods.
For ocean imports into the US, the Importer Security Filing (ISF, also called “10+2”) must be filed at least 24 hours before the cargo is loaded at the foreign port, and the goods must clear customs before the container can be released for pickup. Your freight forwarder or customs broker handles both, but delays there push back every step at the warehouse.
Choose floor-loaded or palletized
How your supplier loads the container is one of the biggest factors in receiving time and cost.
| Floor-loaded (loose cartons) | Palletized | |
|---|---|---|
| What it is | Cartons stacked directly on the container floor, floor to ceiling | Cartons stacked and wrapped on pallets before loading |
| Space used | Fits the most cartons per container | Fewer cartons, because pallets and air gaps take space |
| Unloading | Hand-unloaded by a crew, typically several hours for a 40-foot container | Unloaded by forklift, often in about an hour |
| Best for | Lower freight cost per unit, lightweight cartons, few SKUs | Faster receiving, heavy cartons, many SKUs, retail-ready loads |
As a rough guide, a 20-foot container holds about 10 standard 48″ x 40″ pallets on the floor, and a 40-foot container about 20 to 21. Floor-loading the same boxes usually fits noticeably more product, which lowers ocean freight per unit but adds labor at the warehouse. Ask your 3PL for both costs before you decide.
2. When the container arrives
Drayage and the delivery appointment
Once customs releases the container, a drayage carrier picks it up at the port or rail yard and delivers it to the warehouse. Most 3PLs work by appointment, so the carrier books a delivery window with the warehouse ahead of time. Deliveries that arrive without an appointment may wait or be turned away.
Know the difference between demurrage and detention
- Demurrage is charged when a full container stays at the port or terminal past its free time.
- Detention (often called per diem) is charged when you keep the carrier’s container, and sometimes the chassis, outside the terminal past the free days allowed for returning it.
Free time varies by carrier, port and contract, and both fees add up daily. The best protection is sending documents early, so customs clearance, pickup and unloading happen inside the free window.
3. Unloading and receiving
When the container backs into a dock door, the warehouse team typically:
- Records the seal. The seal number is checked against the bill of lading and photographed before the doors open.
- Photographs the load. Photos of the load as it sits help with any damage claim.
- Unloads the container. Pallets come off by forklift; floor-loaded cartons are unloaded by hand and sorted by SKU.
- Counts and inspects. Cartons are counted against the ASN and checked for crushed, wet or open boxes.
- Captures lot and date codes. For food and other dated goods, lot numbers and expiration dates are recorded so stock can be rotated first-expired, first-out.
- Palletizes and labels. Floor-loaded cartons are built onto pallets, wrapped and labeled with a license plate number for tracking.
- Puts the stock away. Pallets go to storage locations, and the inventory appears in the warehouse management system.
If the count doesn’t match the paperwork, or product arrives damaged, the warehouse issues an over, short and damaged (OS&D) report with photos. That report is what you use to file claims with your supplier or carrier, so review it as soon as it arrives.
4. From storage to outbound
Once your inventory is received, a 3PL can ship it out in whatever form your customers need: full pallets by truckload (FTL) or less-than-truckload (LTL), mixed pallets, or cases. Retail customers often have their own routing guides, with rules for pallet height, labeling (such as GS1-128 shipping labels) and delivery appointments. Share those guides with your warehouse before your first order ships, because a non-compliant delivery can mean chargebacks.
Checklist: before you ship a container to a 3PL
- Packing list and ASN sent to the warehouse at least several days before arrival
- Carton labels showing SKU, quantity and lot or date code on at least two sides
- Decision made on floor-loaded or palletized, with costs from your 3PL for both
- Customs broker and ISF filing arranged before the container ships
- Drayage carrier briefed to book a delivery appointment
- Retail routing guides and labeling rules shared with the warehouse
Frequently asked questions
How long does it take to unload a 40-foot container?
A palletized 40-foot container is usually unloaded by forklift in about an hour. A floor-loaded container is unloaded by hand and typically takes several hours, depending on the number of cartons, their weight and how many SKUs need to be sorted.
What is an ASN?
An advance ship notice tells the warehouse what is arriving before it gets there: the SKUs, quantities, carton counts, container number and expected date. It lets the team plan labor and receive your product accurately.
Who pays for demurrage and detention?
These charges are billed by the ocean carrier or terminal, usually to the importer or its forwarder. They are avoided by moving the container through customs, pickup, unloading and return within the carrier’s free time.
What does a 3PL need to receive a container?
At minimum: a packing list or ASN, the container and seal numbers, the expected arrival date, and a delivery appointment booked by your drayage carrier. Clear carton labels make receiving faster and more accurate.