SIPP & SIOC: designing a box that passes Amazon's tests

What SIPP and SIOC actually are

Both programs belong to Amazon's Frustration-Free Packaging family — the effort to cut over-packaging, damage, and unboxing friction. The common thread is that the product's own packaging is the shipping container: it goes to the customer without a second Amazon box wrapped around it. That's the reward. The obligation on the other side is that your packaging has to prove it can survive shipping alone.

• SIOC — Ships in Own Container. Generally, the product's retail or master box is also its shipping box. Think of a mid-size item whose printed carton is engineered to double as the mailer.
• SIPP — Ships in Product Packaging. Generally applies to items whose existing product packaging is durable enough to ship as-is, without extra protective material added at the fulfillment center.

The exact program names, tiers, and qualifying criteria are defined by Amazon and change over time, so treat the definitions here as the shape of the thing and confirm the current specifics in Seller Central. This article is one spoke in our guide to packaging requirements by sales channel — the same product often needs a different package for FBA, retail, and direct parcels.

Why Amazon rewards shipping in your own container

Every overbox is material, labor, and cube that Amazon would rather not spend. When your package ships in its own container, there's less to buy, less to fill, fewer touches at the fulfillment center, and — importantly for you — lower dimensional weight. Carriers and fulfillment networks bill by the larger of actual and dimensional weight, so a right-sized SIOC box that removes the void an overbox would have added can move your unit into a smaller billable size.

Amazon publishes its packaging incentives and its fee schedules in Seller Central, and both move over time. We won't quote dollar figures here because any number printed on a blog goes stale — check the current amounts and any credits or surcharges in Seller Central directly. The durable takeaway is directional: right-sizing wins on cost almost everywhere, which is a theme that runs through e-commerce packaging generally, not just Amazon.

How Amazon tests the box: ISTA-6-Amazon at a glance

SIPP/SIOC eligibility hinges on transit testing. Amazon references the ISTA 6-Amazon family of test protocols, developed with the International Safe Transit Association to simulate the abuse a single parcel takes in an e-commerce network — the kind of handling an overbox normally absorbs. There are different protocols for over-boxed versus own-container shipments, so the tier that applies depends on how your item ships.

At a high level, a transit-test protocol in this family exercises the package against the real hazards of the supply chain:

• Drop / impact — the free-fall and rotational drops a parcel sees during handling and sortation.
• Compression / stacking — the sustained top load from being stacked in trailers and on pallets.
• Vibration — the road and conveyor vibration that loosens closures and lets a rattling product wear through its own box.
• Random shock / incline — additional impact events some tiers add to mimic rough handling.

The specific drop heights, compression loads, cycle counts, and pass criteria are defined by ISTA and Amazon and vary by tier and product — so confirm the exact protocol and thresholds with ISTA and in Seller Central before you build to them. The strategic point is simpler than the test sheet: passing means your packaging survives on its own merit, without the crutch of an overbox.

Designing a box that passes: the manufacturer's edge

Here's where a company that actually engineers packaging gets ahead of a company that just orders it. You can design most of the failure modes out of the box before it ever reaches a test lab, which turns certification from a gamble into a formality. Four levers do the heavy lifting:

1. Right-size the box. Empty space is the enemy: void lets the product move (failing vibration) and lets the walls cave (failing compression), and it inflates dimensional weight. Cut the headspace to the minimum that still protects the product. A regular slotted container sized to the product is the workhorse here.
2. Spec the board to the derated load. Compression is where SIOC boxes most often fail. A board grade that looks fine on a fresh, single box in a dry room can crush in a humid trailer under a week-old stack. Size the board to the derated load, not the lab-fresh number — humidity alone can cut compression strength by roughly half, and long-duration stacking and die-cut openings take more. Estimate it with the box compression calculator and read the full method in corrugated box strength.
3. Secure the product inside. A snug fit — internal blocking, bracing, or a thermoformed insert — keeps the product from rattling and beating a hole through its own container during the vibration and drop stages.
4. Seal and mark it correctly. Use the right closure and tape pattern, and apply the shipping marks and labels Amazon requires for own-container shipments (including the placement rules that keep barcodes scannable). Confirm the current marking and label spec in Seller Central.

A SIPP/SIOC readiness checklist

Before you commission a transit test, walk the box through this. It's the difference between a first-pass certification and paying for a re-test.

Notice how much of that list is decided at design time. Two rows — the marks and the test tier — are pure lookups against the official sources; the rest are things you build in.

How PackOS helps you design to pass

PackOS was built by a team that manufactures at scale, so the SIOC problem is native to it. Upload artwork or a die file and it detects the structure, rebuilds an editable parametric dieline, and dimensions the box — then it estimates board and compression against the derated load and right-sizes the pack, so you walk into a transit test knowing the box is spec'd to survive rather than hoping it does. From the same model it produces a 3D proof and an instant quote. See the logistics engine on the technology page, or run a real file through Quick Quote. Whatever the tool tells you, treat Amazon and ISTA as the final word on the certification path — verify it there before you commit tooling.