When a retailer has holiday purchase orders on the books and its warehouse partner suddenly cannot guarantee capacity, the calendar becomes the enemy. This client story walks through how a peak season deadline turned a normal 3PL onboarding into a six-week sprint, and what had to go right for it to work.
About this story: this is a composite client story. It combines details from several peak season onboarding projects into a single example, and names and identifying details are left out to protect client confidentiality. The timeline and steps reflect how our team runs a compressed 3PL onboarding before peak season.
The client is a mid-size home goods retailer that sells through national big-box partners and its own Shopify store. Most of its catalog is imported by ocean from Asia, and it carries a few thousand active SKUs across furniture accents, kitchenware, and seasonal decor.
In late August, its existing 3PL told the team it could not guarantee capacity for the fourth quarter. The timing could not have been worse. Holiday purchase orders from two national retail partners had ship windows opening in mid-October, the direct-to-consumer holiday campaign was planned around Black Friday, and several containers were already on the water, booked for delivery to the old warehouse.
Our standard advice, laid out in our guide on how to switch 3PL providers, is to plan on 60 to 90 days and to avoid moving during peak. This project had about six weeks, and three things made it harder than a typical move:
Everything started with data. The client sent its SKU master with dimensions, weights, and case packs, along with each retail partner’s routing guide, all open purchase orders, and the inbound container schedule. Each side named one onboarding lead with authority to make decisions, and the two leads met daily for fifteen minutes.
The Shopify store was connected to the warehouse management system, and EDI mapping began with both retail partners for purchase orders (850), advance ship notices (856), and invoices (810). Test transactions ran with each partner, and carrier accounts were set up for parcel and LTL shipping.
Because Argents handles customs brokerage and freight in-house, the team took over the entries for containers already on the water, updated delivery orders, and booked drayage to the new destination. Freight landing on the West Coast was transloaded at our Seattle hub into domestic trailers, and East Coast arrivals were handled through Charleston.
Remaining inventory moved from the old 3PL in planned waves rather than all at once, so the client never went dark on sales. Every wave was counted on receipt and logged against the transfer manifest. At our Chicago facility, fast-moving holiday SKUs were slotted closest to the pack stations.
Before any live order shipped, the team ran test direct-to-consumer orders end to end and completed a dry run of the first retail purchase order: pick, pack, GS1-128 carton labels, and an advance ship notice checked line by line against the routing guide.
Cutover happened on a set date, with the outgoing 3PL shipping its remaining open orders during a short overlap. A peak labor plan was locked in, and the client received daily reports on orders received, orders shipped, and inventory accuracy.
In a project like this the goal is simple: every retail purchase order ships inside its window, and the holiday direct-to-consumer campaign runs from the new building without a gap in order flow. Getting there depends far more on the first two weeks of data and integration work than on anything that happens on go-live day.
If you are facing a similar deadline, have these ready before the first call with a new provider:
A standard onboarding takes 60 to 90 days. A compressed timeline of around six weeks is possible when the retailer has clean SKU data ready, a decision-maker who can answer questions the same day, and integrations that use standard EDI and ecommerce platform connections.
Yes. Switching close to peak leaves less room to fix problems, so it should only be done when staying put is the bigger risk. A phased inventory transfer, a pilot week of test orders, and a short overlap with the outgoing 3PL reduce that risk considerably.
The essentials are a SKU master with dimensions, weights, and case packs, retailer routing guides and labeling requirements, open purchase orders, the inbound container schedule, EDI contacts for each retail partner, and carrier account details.
Yes, if the 3PL also handles customs brokerage and freight. The broker can file or update entries, change delivery orders, and schedule drayage so containers booked to the old warehouse are delivered to the new one instead.
Routing guide rules, EDI 856 advance ship notices, GS1-128 carton labels, and ship windows matter most, because misses on any of them can trigger retailer chargebacks. Each requirement should be tested on a pilot purchase order before go-live.
If your current warehouse cannot commit to the fourth quarter, the sooner you start, the more options you have. Learn more about our fulfillment solutions or talk to our team about a compressed onboarding plan.