If you sell bundles, gift sets, retail displays, or anything that ships as one unit but arrives as several, you have a choice about where the assembly happens. Your factory can do it and send you finished units. Or the components can ship separately and get combined at the warehouse, close to the customer, shortly before the order goes out.
Factory assembly is almost always cheaper per unit. It is still frequently the wrong answer.
What You Give Up by Deciding Early
A kit built at the factory is a decision locked in months ahead. You are committing to a specific combination, in a specific quantity, before you have any real demand signal for it.
If the bundle sells, you cannot make more without another production run and another ocean transit. If it does not sell, you are holding finished goods that can only be sold one way. Breaking a pre-assembled kit back into its parts is possible, but it is manual, it damages packaging, and nobody budgets for it.
Components are flexible. The same box of product can go out on its own, in a two-pack, in a holiday set, or in a retailer-specific display, and you decide which as the orders come in.
The SKU Arithmetic
This is where kitting quietly gets expensive at the factory. Every combination is its own finished SKU with its own forecast, its own safety stock and its own minimum order quantity. Four products in three bundle configurations is not four SKUs, it is seven, and each one has to be planned separately.
Kitting on demand collapses that back down. You forecast four things instead of seven, and the bundles draw from the same pool of inventory as the singles.
When the Factory Is the Right Call
None of this means warehouse kitting always wins. Assemble at the source when the bundle is your core product rather than a promotion, when volume is high and stable enough that the per-unit saving outweighs the flexibility, when assembly needs equipment or conditions a warehouse does not have, or when the packaging only works if it is built on the production line.
A product that has sold the same way for three years in predictable volume does not need to be kitted domestically. You are paying labour to solve a problem you do not have.
What Warehouse Kitting Actually Costs
Pricing is normally per kit built, and it moves with three things: how many components go in, how fiddly they are to handle, and how many you build at once. A two-component bundle dropped into a shipper is quick. A twelve-piece gift set with tissue, an insert card and a specific arrangement is a different job, and it should be priced like one.
Run size matters more than people expect. Building five hundred of something in one session is far cheaper per unit than building fifty ten times, because the setup is the same either way.
Where It Goes Wrong
The failure mode is almost never the assembly itself. It is the components.
A kit cannot be built until every part of it is on the shelf. One late component stops the whole run, and if that run was scheduled around a launch date or a retailer delivery window, the delay is not recoverable by working faster. Component lead times need to be planned as a set, not individually.
The other one is bill-of-materials drift. The kit changes — a new insert, a swapped colourway, a revised manual — and the warehouse is not told. You find out when a customer receives last season’s version. Any kitting operation worth using should hold a documented build spec and flag a mismatch rather than quietly assembling whatever is nearest.
We handle kitting and assembly alongside pick and pack at our Doral facility, with inventory tracked at component level so you can see what is buildable before you promise a date. Send us your bundle and we will price the build.