What Is Product Kitting and Bundling? A Guide for eCommerce Brands

What is product kitting?

Kitting is when a warehouse takes two or more separate SKUs and pre-assembles them into a single new SKU that is ready to ship. The kit gets its own barcode and shelf location. When an order comes in, the team picks one item, not three, which makes packing faster and cheaper.

A skincare brand selling a "starter set" of cleanser, moisturizer, and serum is a classic kit. So is a meal kit, a tools-and-hardware bundle, and a curated subscription box.

How is bundling different from kitting?

Bundling is the broader term. It means selling two or more items together as one product. Kitting is the warehouse work that makes bundling possible at scale. There are two ways to do it:

Pre-built kits: the warehouse assembles a batch of bundles up front, and they sit on the shelf as one SKU. Best for high-volume sets.

Virtual or on-the-fly bundles: the warehouse picks the individual items and packs them together at order time. Best for low-volume or custom bundles.

Most brands use a mix. Top-selling sets get pre-built. Slow-moving or seasonal bundles get assembled on demand.

When kitting pays off

You sell the same combination of products often

Your hottest SKUs are part of a "set," "starter pack," or "gift bundle"

You run subscription boxes or monthly drops

Picking individual items is slowing down your shipping cutoff

Buyers expect a single, polished unboxing experience

How kitting actually saves you money

The savings come from three places:

Lower pick fees. One pick costs less than three picks.

Faster ship-out. A pre-built kit takes seconds to grab; a multi-item order takes minutes.

Less packing material per order, since the kit can be sized and packaged once.

Higher average order value when bundles are part of your store layout.

There is a small upfront cost: the warehouse charges a per-unit kitting fee to assemble the batch. For high-velocity SKUs, that pays back in lower pick fees within weeks.

How to set up kitting with a 3PL

Tell your 3PL:

Which SKUs are in the kit and how many of each

How many kits you want assembled at a time (start with 2 to 4 weeks of demand)

What the finished kit should look like: poly bag, branded box, insert card, gift wrap

Whether the kit gets its own barcode (recommended) or uses an existing SKU

A good 3PL prices kitting per unit handled, so a three-item kit costs three small fees plus the assembly time. Ask for the per-kit rate before you commit.

Kitting and bundling at 3PL Center

We assemble kits and bundles at our California and New Jersey warehouses. Our team can pre-build sets, drop in branded inserts, and label finished kits with their own barcodes so they pick clean. Orders that land by 2pm local ship the same day, kits included.

See the full breakdown on our kitting and assembly service page, or request a quote with your kit details.