What is kitting and assembly?
Short answer
Kitting is the process of combining several individual SKUs into a single new SKU — a bundle, gift set, subscription box or retail display. Assembly adds light manufacturing steps such as inserting literature, applying labels or building displays. Both can be done in advance or at the moment an order is picked.
Pre-kitting vs on-demand kitting
Pre-kitting builds a run of finished kits in advance and stores them as their own SKU. Picking is then a single scan, which is fast and cheap per order — but the components are locked into the kit and can't be sold individually without a teardown.
On-demand kitting assembles the bundle at pick time from loose component inventory. Nothing is committed in advance, so components stay available for standalone sale, but each order costs more to pick.
The rule of thumb: pre-kit predictable, high-volume bundles and subscription boxes; kit on demand for promotional or seasonal bundles whose take rate you can't forecast.
Common kitting projects
Kitting covers a wide range of work that sits between warehousing and light manufacturing.
- Monthly subscription boxes with rotating contents
- Buy-one-get-one and multipack retail bundles
- Holiday and gift sets with custom packaging
- Retail-ready displays and pallet displays for big-box programs
- Amazon FBA multipacks with the correct FNSKU labeling
- Sample and influencer PR kits
- Component assembly with instruction inserts and warranty cards
What we need to build your kit right
The single biggest cause of kitting errors is an ambiguous bill of materials. Give the warehouse a document that leaves nothing to interpretation.
- Bill of materials: every component SKU and its quantity
- The finished-good SKU and barcode for the assembled kit
- Photos or a physical sample of the completed kit
- Packaging materials specification and where they come from
- Insert placement and orientation requirements
- QC criteria — what makes a kit acceptable or rejected
Inventory accounting for kits
A kit is a real inventory position, and it should be visible as one. In Extensiv, a pre-built kit shows as its own SKU with its own on-hand count, while the component SKUs are decremented at build time. That prevents the classic failure mode where a brand oversells components that are already committed inside finished kits.
We run kitting projects on tables inside the same secured facility that stores your inventory, so components never leave the building and there's no third-party handoff to reconcile.
Want this answered for your specific operation?
Send us your order profile and SKU list — we'll model your real numbers from our Vernon, CA warehouse. Month to month, no long-term contract.