Switching 3PLs · Migration · Operations
How to switch 3PL providers without disrupting orders
· 9 min read · SuperFulfill
Most fulfillment migrations that go wrong fail in the handover rather than at the new warehouse: stock arrives without the data to receive it, orders keep flowing to a provider that has run out, or nobody owns the cutover day. A 3PL migration is a project with a sequence, an owner and a test before go-live.
This guide sets out that sequence for an e-commerce brand moving between fulfillment providers, whichever provider you choose. The final section explains how a move to SuperFulfill works.
Before you start: contract, notice and data
Read your current agreement before you announce anything. Three clauses matter most: the notice period, any charges for removing inventory (sometimes called outbound, de-kitting or exit fees), and what happens to stock and data when the agreement ends.
Then export your data while you still have full access: SKU master data with dimensions and weights, current stock by SKU and lot, several months of order history, returns, and your packaging specifications. A new provider quotes and plans from this data, and you'll want it to check the closing stock count later.
The data a new provider needs to quote and plan
A quote built on guesses changes once real orders arrive. These are the inputs that make a fulfillment quote and a migration plan accurate:
| Data | Why it matters | Where to find it |
|---|---|---|
| Monthly orders and seasonality | Sets staffing, storage and the order-fee calculation; peaks matter as much as averages | Store analytics or your current 3PL's invoices |
| Units per order | Multi-unit orders change picking work and parcel size | Order history export |
| SKU list with packed sizes and weights | Drives storage space and the shipping quote, which is billed on the greater of actual and volumetric weight | SKU master data or product specifications |
| Destinations by share of orders | Shipping cost and options depend on each destination | Order history by country |
| Current stock by SKU and location | Plans the inventory move and the opening count | Current 3PL stock report |
| Packaging and inserts | Confirms what is packed, by whom it's supplied and what it costs | Packing specifications |
| Sales channels | Shopify, marketplaces and wholesale orders each need an order route and tracking return | Your store and marketplace accounts |
| Current invoices | The baseline for comparing true cost per order | Last two or three months of invoices |
Choose how inventory moves
There are three common ways to move stock. Many brands combine them.
| Approach | How it works | Watch out for |
|---|---|---|
| Full transfer | All stock is collected from the current provider and shipped to the new one in one move | Stock is in transit and can't be sold for that period; count it out and count it in |
| Sell through, then switch | Existing stock sells from the current provider while new production goes to the new one | Two locations for a while; plan which orders go where |
| New production direct | The next production run ships from the factory straight to the new provider | Timing depends on the production schedule; works well alongside sell-through |
Whichever you choose, the receiving provider should count each delivery against a packing list and report discrepancies before the stock goes live in your store. That count is your opening balance with the new provider.
Open orders and the cutover
The cutover is the moment new orders start routing to the new provider. Decide it in advance and write it down:
- Orders already released to the current provider are fulfilled there. Agree a final release time with them.
- New orders route to the new provider only once its stock is checked in and the store connection has been tested with real orders.
- Backorders and pre-orders need an explicit owner: list them and agree which provider ships each one.
- Pause inventory sync from the old provider at the cutover so it can't overwrite stock levels the new provider has counted.
- Agree how tracking numbers flow back to your store and customers from both providers during the overlap.
Test before you go live
Run a small number of real or test orders end to end before switching all traffic:
- Orders arrive at the new provider with the right SKUs, quantities and shipping service.
- Multi-unit and bundle orders are picked and packed correctly.
- Packaging and inserts match your specification.
- Tracking numbers return to the store and the customer notification is sent.
- Stock levels in the store match the counted stock.
Risks to review, and how to reduce them
| Risk | How to reduce it |
|---|---|
| Stock arrives without matching records | Send the SKU list and an advance shipping notice before the stock leaves |
| Overselling during the move | Lower available stock in the store for the transfer period, or move in phases |
| Orders sent to the wrong provider | Set one cutover time and route by rule, not by hand |
| Shipping costs higher than quoted | Have shipping quoted on packed parcel sizes and weights, not product sizes |
| Unexpected exit charges | Read the current agreement's removal and termination terms before giving notice |
| Customer confusion | Tell your support team the dates; update delivery-time wording in your store if it changes |
3PL migration checklist
- Plan: read the current agreement, export data, set a target cutover date and a single owner.
- Quote: send the data above to the providers you are comparing; compare true cost per order, not headline fees.
- Agree: confirm rates, packaging, channels and the transition plan in writing.
- Move: send SKU data first, then stock, by transfer, sell-through or new production.
- Receive: check each delivery against its packing list and resolve discrepancies.
- Connect: connect the store and test real orders end to end.
- Cut over: route new orders at the agreed time; let the old provider finish its released orders.
- Close: reconcile final stock and invoices with the previous provider.
How switching to SuperFulfill works
You share your products, monthly order volume, destinations and current setup, and we prepare a fulfillment and shipping quotation. Once terms are agreed, we plan the inventory move with you. We can help coordinate inventory transfers from your existing fulfillment provider. Collection arrangements and any associated costs can be discussed during your migration review. Customs, international freight and other third-party charges are not automatically covered. New production can also ship from your factory straight to your assigned warehouse in China.
Each delivery is counted against your packing list, condition-checked and photographed on arrival. After stock arrives, standard onboarding takes approximately 1–2 business days, covering check-in and testing the store connection. Collection, manufacturing and transport to the warehouse are outside that period. Your account manager confirms when orders can start.