Kitting is the process of assembling multiple individual products into a single sellable unit — a bundle, a gift set, a starter kit, or a subscription box. It sounds simple. In practice, it is one of the most time-consuming and error-prone operations for brands doing it in-house.**What Kitting Includes**A typical kitting operation involves: receiving component inventory from multiple suppliers, staging components by kit type, assembling kits according to a bill of materials (BOM), quality checking each completed kit, applying a new barcode or SKU to the finished kit, and putting completed kits into sellable inventory.For subscription boxes, this happens monthly for potentially thousands of subscribers simultaneously.**When to Outsource Kitting**The signal that it is time to outsource kitting is when your team spends more than 20% of their time on assembly. Kitting is labor-intensive, repetitive, and error-prone when done by people who are also trying to run the rest of the business.Professional kitting operations use assembly-line techniques, trained staff, quality checkpoints, and scan verification — achieving accuracy rates that in-house teams rarely match.**The Bill of Materials**A BOM (bill of materials) is the document that defines every component in a kit: which SKUs, how many of each, in what configuration, with what packaging. You provide the BOM; we build to it.If your kit configurations change monthly — different products, seasonal variations — we update the BOM and run the new configuration. We can manage multiple kit variants simultaneously.**FBA Bundle Prep**Amazon sellers who want to create multi-item bundles for FBA need kitting plus FBA prep — the bundle assembled, given a new FNSKU, and poly-bagged per Amazon requirements. We do both in the same workflow.3PLCity handles kitting projects from 100 kits to 100,000, with 24-48 hour turnaround on standard projects.