Launching a New Product Through Your 3PL: Kits, Retailer Shipments and D2C Orders in the Same Window

Product launch fulfilment works when your 3PL plans the whole window as one programme: component inbounds scheduled against kit runs, retailer and marketplace stock ring-fenced before D2C goes live, pre-orders capped against confirmed arrivals, and launch-day labour booked in advance. Fulfil with Synergy runs launches this way from its Northampton fulfilment centre, kits included.

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Most launch problems I see are not caused by the warehouse being slow. They happen because three channels want the same stock in the same fortnight, and nobody decided in advance who gets it first. This article covers the decisions to make with your 3PL before launch day, and how our kitting and assembly service fits into them. If you want the broader picture of how value-added work supports campaigns, we've covered how value-added fulfilment supports launches, promotions and seasonal campaigns separately. This piece is about running the launch window itself.

Why a launch window behaves differently from normal trading

A launch window is the short period in which new stock arrives, gets assembled into sellable units and leaves for several channels at once, each with its own rules and deadlines. Normal trading draws on stock that already exists. A launch draws on stock that is still arriving.

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That changes the work in three ways. Retailers such as Boots or ASOS want finished, labelled cases delivered into a booked slot. Amazon wants prepared units sent in against its own inbound process. Your D2C site wants single orders packed within your cut-off, often in a spike the moment the email goes out. All three depend on components that may land on different days from different suppliers.

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Fulfil with Synergy is a founder-led UK 3PL and growth partner for ambitious, fast-growing consumer brands, operating a technology-led fulfilment centre in Northampton for health, wellness, beauty, supplement and lifestyle brands across D2C, marketplace, retail and wholesale channels. Launches are where those channels collide, which is why we plan them as a single programme rather than three separate jobs.

What Hello Bubble's launch taught us about building kits while stock is still arriving

The main lesson from Hello Bubble is that a launch plan has to be built around when components arrive, not around the launch date. The date is fixed; the inbound picture is not.

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Hello Bubble, a skincare brand, joined Fulfil with Synergy in April 2025. Within days of signing, the requirement grew to 400,000 kits across 8 variations plus 2 million individual units, with sizeable shipments into Boots, ASOS and Amazon. Our team designed the programme within hours, recruited and onboarded 30 new colleagues within one week, and staggered production over 10 weeks because SKUs and packaging were arriving at different times. As the Hello Bubble case study puts it: "When the requirement changed, our team took ownership of it."

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Three principles come out of work at that scale, and they apply to a 5,000-kit launch as much as a 400,000-kit one:

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• Sequence by readiness, not by priority alone. If one variation has every component and its packaging on site, build it now. Waiting to build the "hero" kit first leaves people idle while that last carton is on a lorry.
• Treat each variation as its own production line. Eight variations means eight bills of materials, eight sets of packaging and eight things that can be short. Planning them as one job hides the gaps.
• Book labour against the production plan, not the order forecast. Assembly volume peaks when components land, which can be weeks before the first customer order.

Getting the inbound schedule right before anything is assembled

Inbound scheduling for a launch means telling your 3PL what is arriving, when, from whom and in what form, early enough for them to plan space, labour and checks. A kit can only be built as fast as its slowest component arrives.

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Give your 3PL three things as soon as you have them. First, a launch forecast split by channel: retailer purchase orders, Amazon quantities and expected D2C demand in the first weeks. Second, every inbound as pre-advice, component by component, with supplier and expected date. Third, the bill of materials for each kit, including inserts, outer packaging and any labels.

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At Fulfil with Synergy, brands raise pre-advice through the 24/7 client portal, and inbound status is visible there as it moves. At goods-in, Cubiscan captures weight, dimensions and imagery for each SKU, which matters for new launch products that have never been through the building before. Discrepancies are flagged in real time, photographed, logged and resolved with you, so a short delivery of one component shows up the day it lands rather than the day the kit line stops.

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My advice from experience: bring your 3PL in before packaging artwork is signed off. Box dimensions decide how kits are built, how many fit a retailer case and which carton the D2C order ships in.

Sequencing kit production across a staggered window

Kit sequencing is the order in which you assemble variations so that each channel's deadline is met with the components you actually have. Retailer and marketplace kits usually come first because their delivery dates are contractual and their volumes are known.

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There are two ways to make a kit, and a launch often needs both. Pre-built kits are assembled in advance and stored as finished units. These suit retailer shipments, where the buyer expects a finished product with its own barcode. GS1 guidance says a newly created physical bundle needs its own GTIN assigned by its creator, so allow time for that before the retail run starts. Built-to-order kits are assembled when the D2C order drops. Fulfil with Synergy's warehouse management system builds kits and bundles on demand, so stock isn't tied up in pre-built units you may not sell.

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Before any run, agree a signed-off sample of each finished kit. Our value-added team works to that sample, with QC checks during assembly and barcode printing on site. Manual pick faces sit alongside our 57,000-tote AutoStore grid for exactly this kind of hands-on work, so kit assembly doesn't compete with automated order picking.

One stock pool, three claims on it: allocating between retailers, Amazon and D2C

Allocation means deciding, before launch, how much of each SKU is reserved for each channel, and what happens when demand runs ahead of supply. Running every channel from one stock pool gives you flexibility, but only if the reservations are set deliberately.

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The order that protects most launches is:

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1. Retailer purchase orders first. These carry fixed delivery dates and booked slots. Missing one damages a relationship you worked hard to win, and late deliveries are a common reason wholesale deliveries get rejected at the DC.
2. Marketplace inbound second. If you send stock into Amazon, its quantity and prep need locking before D2C goes live.
3. D2C from the remainder, with a buffer. Your own site is the channel you control best, so it is the one that flexes.

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Fulfil with Synergy runs multi-channel and retail fulfilment from one stock pool on RedPrairie Dispatcher WMS. Inventory is tracked in real time to unit, SKU, batch and location, with automated back-order rules. FEFO and FIFO are applied automatically, which matters for skincare and supplement launches where batches carry dates.

Pre-orders: sell what is confirmed, not what is hoped for

Pre-orders let you take D2C demand before stock arrives, but they should be capped against confirmed inbound quantities and dates. In Shopify this usually means the continue selling when out of stock setting, which Shopify lists as a way to offer products for pre-order. Left uncapped, that setting will keep taking orders against stock that doesn't exist.

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Agree with your 3PL how pre-orders release: usually in order date sequence, once the kit or unit is booked in and available. Then set the ship date you show customers from the inbound schedule, not the marketing calendar. The same overselling discipline applies to handling deal-site spikes without overselling.

Launch day itself: capacity booked in advance, not found on the day

Launch-day capacity means having enough trained people, pack benches and carrier collections in place for the first spike of D2C orders, while retailer and marketplace work carries on. It has to be booked in advance.

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My strongest recommendation is to finish the main retailer despatches before D2C goes live. That keeps the launch day floor focused on single orders and means a delayed retail collection can't block your customers' parcels.

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Fulfil with Synergy has around 250 permanent fulfilment specialists, supported by a pool of around 300 trained agency colleagues, and can scale up to 80% above baseline headcount. The site operates 6am to 10pm, with additional night shifts during peak, and the standard cut-off for next-day despatch is 9pm Sunday to Friday. We work with around 27 UK and international carriers, so launch volumes can be spread rather than resting on one collection. Hello Bubble's 30 colleagues onboarded in a week shows how quickly that resource can be stood up when the plan calls for it.

Who talks to whom during the launch

Launch communication works when one person on each side owns the plan, updates follow a fixed rhythm and problems escalate quickly. Most launch failures I've seen started as a change one team knew about and the other didn't.

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At Fulfil with Synergy, each brand has a named Client Manager and a Client Support Specialist on the floor, with an escalation path to the Head of Operations, the COO and to me directly. During a launch, agree a weekly status covering inbounds, kit progress, allocations and risks, then move to daily updates in launch week.

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The biggest risk is a silent change. If marketing moves the launch date, a retailer amends a purchase order or a supplier slips a component, tell your 3PL the same day. Luis R. Candido, Sr, Director of Global Operations at RevitaLash Cosmetics, described RevitaLash's UK launch with Fulfil with Synergy this way: "From the initial implementation, the experience was well organized, collaborative, and focused on ensuring a successful launch." He also called Fulfil with Synergy "a strategic value-added partner."

FAQ

How early should I involve my 3PL in a product launch?

Involve your 3PL as soon as you know the launch date, the channels and the component suppliers, and ideally before packaging artwork is final. That gives the warehouse time to plan space, labour, kit sequencing and retailer bookings around real inbound dates. Late involvement is the main reason launches feel rushed. Fulfil with Synergy can mobilise quickly, as Hello Bubble showed, but early notice lets you test kit samples, confirm barcodes and set channel allocations calmly rather than in launch week.

Can a 3PL assemble launch kits while components are still arriving?

Yes, if production is staggered by variation. Each kit is built once its full bill of materials and packaging are on site, while other variations wait for their components. Fulfil with Synergy staggered Hello Bubble's 400,000 kits across 8 variations over 10 weeks because SKUs and packaging arrived at different times. The key is accurate pre-advice and real-time goods-in checks, so a short component is spotted on arrival and the sequence can be adjusted before the line stops.

Should launch kits be pre-built or built when the order comes in?

Usually both. Retailer kits are normally pre-built, because buyers expect finished units with their own barcode delivered on a fixed date. D2C kits can be built to order, which avoids locking components into kits that may not sell. Fulfil with Synergy's warehouse management system handles bundles on demand for D2C while the value-added team pre-builds retail stock. Agree the split by channel early so components are allocated to the right method.

How do I stop D2C demand using up stock promised to Boots, ASOS or Amazon?

Reserve stock by channel before your D2C site goes live. Retailer purchase orders and marketplace inbounds should be ring-fenced first, with D2C selling from the remainder plus a small buffer. Pre-orders should be capped against confirmed inbound quantities. Fulfil with Synergy runs all channels from one stock pool on RedPrairie Dispatcher WMS with real-time inventory and automated back-order rules, so allocations are visible to you in the client portal throughout the launch.

Does Fulfil with Synergy offer kitting and assembly for product launches?

Yes. Fulfil with Synergy provides kitting, bundling, gifting, branded packaging, subscription box assembly, re-labelling, QC checks and barcode printing from its Northampton fulfilment centre. The team has delivered launch programmes at scale, including 400,000 kits and 2 million individual units for Hello Bubble with shipments into Boots, ASOS and Amazon. Kitting runs alongside D2C, marketplace and retail fulfilment from the same stock pool, so one partner handles the whole launch window. Product launch fulfilment comes down to a few decisions made early: schedule inbounds component by component, sequence kits by readiness, ring-fence retailer and marketplace stock before D2C goes live, cap pre-orders against confirmed arrivals and book launch-day capacity in advance. Get those right and the launch window becomes a production plan rather than a scramble.

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Fulfil with Synergy brings kitting and assembly, retail and marketplace despatch, D2C fulfilment and a team that has scaled 30 colleagues in a week under one roof in Northampton. If you have a launch coming up, talk to the Fulfil with Synergy team about your launch and we'll plan the window with you.

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