Think about what goes into a five-piece gift set: five picks, a box fold, a tissue wrap, an insert card, a seal and a label. Any one of those steps can go wrong. It's also why kitting quotes are hard to compare. Some warehouses price the finished kit, some bill the labor by the hour, and some leave materials off the quote until the first invoice arrives. Below is a way to estimate a fair price before you ask anyone, plus the checklist we'd want from any brand handing us a kit.
Outsourced kitting is usually priced per finished kit, and the price is driven by the number of touches: each component placed, each fold, wrap, insert, seal and label. Simple two- or three-unit multipacks commonly land under about $1 per kit before materials. Multi-component gift sets with retail packaging often run $1.50 to $3 or more. To sanity-check a quote, count the touches, estimate 6 to 12 seconds each, multiply by a loaded labor rate, then add materials and setup. If a quote is far below that floor, something is being left out.
Kitting, Bundling, Assembly: Three Words, Three Jobs
These terms get used interchangeably in quotes, and mixing them up costs money. We use them like this:
- Bundling is a merchandising decision. You decide to sell a cleanser and a moisturizer together at one price. A bundle can exist purely in your storefront, with the two items picked separately and dropped in the same box at pack time.
- Kitting is the physical work that turns a bundle into its own inventory item. The components are pulled, combined into a single package, and labeled with a new barcode. From that moment the warehouse tracks the finished kit as one SKU with its own bin location.
- Assembly is the umbrella for value-added work on inventory before it ships: inserting a thank-you card, shrink-wrapping a set, applying hang tags, swapping retail packaging, or putting a product and its accessories together for the first time.
The distinction matters because a "bundle" that's picked as separate items at pack time is billed as a multi-item order, while a true kit is billed as assembly labor up front and a single-item pick later. Some brands pay twice without realizing it: once to build the kit, and again as extra-item pick fees because the kit was never set up as its own SKU in the warehouse system.
Build Ahead or Build to Order?
The first decision is timing. You can assemble kits in batches before orders arrive, or assemble each kit when its order drops. Neither is better in general. The right one depends on how predictable the kit's sales are.
If you sell the same kit on Shopify and Amazon, you'll usually pre-build at least the Amazon allocation. Amazon receives kits as finished units with an FNSKU on the outside, so build-to-order isn't an option for inventory headed into FBA.
How Kitting Gets Priced: Count the Touches
However it's presented, a per-kit quote comes down to labor time, materials and setup. Labor is almost always the biggest piece, and labor time depends on how many separate actions the kit needs. We call those touches.
A worked example
Take a hypothetical skincare set: three products, a folding gift box, a tissue wrap, an insert card, a sticker seal and a barcode label. That's 3 component placements plus 5 packaging actions, or 8 touches. At 9 seconds a touch, that's 72 seconds of labor. At a loaded rate of $24 an hour, 72 seconds costs about $0.48. Add $0.90 for the box, tissue, card and sticker, and spread a $150 setup across a 1,000-kit run (another $0.15), and you land near $1.53 per kit.
Those inputs are assumptions, not a rate card. Swap in your own touch count and materials and the formula still holds. What it gives you is a floor. A quote well above it should come with a reason, like fragile glass or a complicated fold. A quote well below it usually means materials or setup will show up later as separate lines.
The Build Sheet Is the Contract
Almost every kitting dispute we've heard about comes down to the same root cause: the warehouse built what the instructions said, and the instructions didn't say what the brand meant. A build sheet (sometimes called a bill of materials or kit spec) closes that gap. A good one answers these questions before anyone has to ask.
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Exactly which SKUs, and how many of each
List components by SKU and barcode, not just product name. "Lip balm" is ambiguous if you carry four flavors. If a component has variants that look nearly identical, say so, so they can be staged apart.
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A photo of the finished kit, open and closed
Orientation, which product sits on top, which way the logo faces, where the card goes. A photo settles in one second what a paragraph can't.
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Packaging and labeling spec
Box or bag size, fill material, seal method, and where the kit barcode goes. For Amazon kits, include the FNSKU and state that inner unit barcodes must be covered.
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What to do when a component runs short
Stop the run and notify you? Substitute an approved alternate? Build partial kits and hold them? Decide this in advance, because the answer at 4pm on a Friday won't be the one you'd choose.
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The quality check
What gets verified, and how often. A common approach is a full check of the first kit, then a weight check or spot-open on a set interval. Weight checks are cheap and catch a surprising share of missing-component errors.
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A version number and date
Kits change. A new insert card or a reformulated product means a new spec. Versioning prevents the old card from being used up "because it was still on the shelf."
Where Kitting Errors Come From
Kitting mistakes are rarely random. They cluster around a handful of predictable conditions, and each one has a structural fix.
Two shades in the same tube, two sizes in the same pouch. Fix: stage them at separate ends of the station, and scan each component rather than eyeballing it.
The team runs out of one item and "makes it work." Fix: count all components against the run size before starting, and write the shortage rule into the build sheet.
The March run is built from memory of the December run. Fix: a versioned build sheet printed at the station for every run.
Kits are built but components are never deducted in the system, so both show as available. Fix: record the build as a transaction that consumes components and creates kits.
Doing It Yourself vs. Handing It Off
Plenty of brands kit in-house, and at low volume that's often the right call. The trouble is that the in-house cost is spread across places a spreadsheet doesn't look: a corner of the office that could hold inventory, a part-timer's afternoon, and the founder checking every tenth box.
To put numbers on it, take a hypothetical brand building 800 of the skincare sets above each month, in-house:
- Assembly labor at 72 seconds per kit is 16 hours. Add staging, cleanup and restocking and it's closer to 24 hours, or about $580 at $24 an hour loaded.
- Workspace for a kitting table and component shelving, at a modest share of rent and utilities: say $350.
- Materials at $0.90 per kit: $720 (you pay this either way).
- Owner or manager time for spot checks, reorders and fixing mistakes, 3 hours a week valued at $60 an hour: $720.
That's roughly $2,370 a month, or about $2.96 per kit, and more than half of it never appears on an invoice. Outsourced at the $1.53 estimate from earlier, the same 800 kits would run about $1,225. The gap narrows if your space and time cost you nothing, and it widens quickly as volume grows or kits get more complex.
Timing matters as much as cost. Holiday gift sets need to be built in October and November, which is when your team is busiest with everything else. A warehouse that kits every week can add people to a run without you hiring anyone.
Kitting for Amazon: The Rules Shopify Doesn't Have
A kit headed into FBA has to satisfy Amazon's receiving rules, and those are stricter than anything your own storefront asks for.
- One scannable barcode on the outside. The kit gets its own FNSKU, and any barcodes on the individual units inside must be covered or hidden so a scanner can't pick them up by mistake.
- "Sold as set" labeling. Multipacks and sets need a "Sold as set" or "Do not separate" sticker so fulfillment center staff don't break them apart.
- Packaging that survives on its own. Bagged kits need poly bags at the thickness Amazon requires and a suffocation warning when the opening is large enough to need one.
- A listing that matches the kit. Amazon has its own policy on what counts as a valid bundle, including that the items be complementary. Check that your kit qualifies before you build a thousand of them.
Because Amazon stopped offering its own prep and labeling services in the US at the start of 2026, kits now need to arrive fully compliant. See our FBA prep mistakes checklist for the full list of what gets shipments rejected.
Frequently Asked Questions
Bundling is the decision to sell products together at one price, and it can exist only in your storefront. Kitting is the warehouse work that physically combines those products into one package with its own barcode, so the finished kit is stored and picked as a single SKU.
It depends mostly on the number of touches: components placed plus packaging steps. Simple multipacks commonly run under about $1 per kit before materials, while multi-component gift sets with retail packaging often land between $1.50 and $3 or more. Use touches × seconds per touch × a loaded labor rate, plus materials and setup, to estimate a floor before you request quotes.
Pre-build kits that sell steadily or are going to Amazon FBA, since batching is cheaper per unit. Build to order when a kit has many variants, when demand is uncertain, or when the components also sell on their own, so you don't strand inventory inside kits that may not sell.
Component SKUs and quantities, a photo of the finished kit, packaging and label specs, the rule for what to do if a component runs short, the quality check to perform, and a version number and date. A complete build sheet prevents most kitting errors and settles who is responsible when one happens.
When the hidden costs of in-house kitting (space, part-time labor, and owner time spent checking and fixing kits) start to exceed an outsourced per-kit rate, when kits get complex enough to need a proper station and quality checks, or when seasonal gift sets need to be built during your busiest weeks.
Yes. A prep-capable 3PL can assemble multipacks and sets, cover the inner unit barcodes, apply the kit's FNSKU and a "Sold as set" label, and ship the finished units into FBA. Since Amazon stopped offering prep services in the US in 2026, kits must arrive fully compliant.
Building a kit should consume the component inventory and create kit inventory in the same transaction. If the warehouse system doesn't record builds that way, components and finished kits can both appear available at once, which leads to overselling.
Have a kit you want built right every time?
Send us your build sheet, or a photo of the finished kit and the component list, plus your monthly volume. We'll quote it per kit and tell you whether pre-building or building to order makes more sense.