Verified & Reviewed

Published on October 12, 2026 Written By Rachel Hand

SIOC packaging means “ships in own container,” a model where a product travels to the customer in its own retail box with no extra shipping carton around it. SIOC packaging sits inside Amazon’s current seller program, Ships in Product Packaging (SIPP), which folded the older Frustration-Free Packaging and SIOC labels into one framework in late 2023.

There’s also a fresh reason to care in 2026. New packaging fees took effect for small and large bulky products in the US on January 15, 2026, and for oversize products in the EU on February 1, 2026. The fees apply to items not enrolled in Ships in Product Packaging that require additional packaging. That single change turned SIOC from a nice-to-have into a margin decision for a lot of catalogs.

This guide covers what SIOC packaging is, what qualifies, how testing and certification actually work, and how any ecommerce brand can adopt the model even without shipping through Amazon.

What is SIOC packaging?

SIOC stands for “ships in own container.” It’s a form of product packaging in which an ordered product ships to the customer in its original packaging, without additional packaging such as an overbox.

The program framing has changed, so here’s the current structure:

SIPP is Amazon’s seller-side umbrella program, and FFP and SIOC live on inside it as tiers.
Tier 1 (FFP) meets every SIOC standard and adds recyclability and customer-experience requirements on top.
Tier 2 (SIOC) is a sellable unit that can ship safely in its own manufacturer’s package, without extra Amazon prep or an overbox.
The old Prep-Free Packaging tier has been retired on the seller side, though Amazon’s vendor and 1P documentation still references SIOC, FFP, and PFP terminology.

Here’s a quick reference for the acronyms that trip people up:

The governing principle behind every tier is simple. The product’s own packaging has to be durable enough to survive parcel delivery unprotected, taking the drops, vibration, and compression of transit without a second box.

That single standard drives the eligibility rules and the lab testing covered later. It’s also why not every product is a fit. For the current specifications, Amazon’s SIPP guidelines in Seller Central are the source of record.

Why online shops prefer SIOC packaging

Amazon’s scale drove the rise of the SIOC model, but ecommerce operators adopt it on their own terms, whether or not they sell through Amazon.

The appeal comes down to three things: waste reduction, lower costs, and a cleaner customer experience.

Each one stands on its own, and together they explain why SIOC packaging keeps spreading across direct-to-consumer brands.

1. Waste reduction

SIOC packaging cuts excess materials out of every shipment. That makes it more sustainable than most conventional models, especially at the volume Amazon and large DTC brands move each day.

As ecommerce keeps growing, that reduction adds up fast. Fewer boxes and less void fill mean less material produced, shipped, and eventually thrown away.

Material choice is part of the design work, not an afterthought. Building the primary package from curbside-recyclable materials keeps the whole shipment out of the landfill. It also sets up eligibility for the higher FFP tier, which requires recyclable construction.

2. Lower costs

Complying with SIOC requirements means products ship with less dunnage and fewer materials. Brands stop paying for air pillows, kraft paper, and the outer box on qualifying orders.

The bigger lever is dimensional weight: Removing the overbox shrinks a parcel’s cubic dimensions. That lowers its DIM weight and the billable rate carriers charge, so the savings run well past the cost of cardboard. Fulfillment labor drops too: no void-fill step, fewer touchpoints, and a simpler pack-station workflow.

Weigh the offsetting costs honestly before you switch. Redesigning packaging, paying for ISTA testing, and accepting a lower damage tolerance are all real line items, so judge SIOC with a per-SKU ROI comparison, not a blanket promise of huge savings.

Some SIOC-qualified products still need additional material for specific reasons, which is a business call rather than a rule.

3. Better customer experiences

The primary goal of SIOC is delivering packages in the best condition possible with the contents undamaged.

Testing and design standards help ensure damage-free delivery without extra packaging. They also simplify the unboxing experience by removing layers the customer has to dig through.

SIOC can also strengthen your brand. When the Amazon-branded box disappears and your own packaging shows up at the door, that’s a stronger first impression and a step toward repeat purchases.

As an ecommerce fulfillment expert and supply chain enablement platform, ShipBob built its Customization Suite for exactly this balance. It handles branded boxes, mailers, tissue, on-demand marketing inserts, and printed gift notes inside the fulfillment center, so efficient packaging doesn’t cost you presentation.

Fast-growing brands such as Our Place and Bloom use it to keep a premium, on-brand unboxing moment as they scale.

“ShipBob not only integrates our custom packaging into their processes but also incorporates it into their boxing algorithm. This ensures that every parcel is packed in the appropriately sized box, maximizing efficiency. With ShipBob’s technology, we can promptly identify whether items are being packed in the most space-efficient manner or if there are opportunities for improvement based on item dimensions.” Ali Shahid, COO of Our Place

“ShipBob not only integrates our custom packaging into their processes but also incorporates it into their boxing algorithm. This ensures that every parcel is packed in the appropriately sized box, maximizing efficiency. With ShipBob’s technology, we can promptly identify whether items are being packed in the most space-efficient manner or if there are opportunities for improvement based on item dimensions.”

Ali Shahid, COO of Our Place

“Having the ability to customize and offer premium unboxing experiences for customers is a fairly unique offering, and oftentimes it’s difficult to find partners who can do it at all – let alone at the scale Bloom operates at. So ShipBob letting us use our own packaging for hundreds of thousands of DTC orders is a pretty rare feature that we don’t take for granted.” Neil Blewitt, SVP of Operations at Bloom Nutrition

“Having the ability to customize and offer premium unboxing experiences for customers is a fairly unique offering, and oftentimes it’s difficult to find partners who can do it at all – let alone at the scale Bloom operates at. So ShipBob letting us use our own packaging for hundreds of thousands of DTC orders is a pretty rare feature that we don’t take for granted.”

Neil Blewitt, SVP of Operations at Bloom Nutrition

SIOC isn’t the right call for every order, though. Gifting, discreet categories, and theft-attractive items are cases where a customer may still prefer a plain overbox, even when SIOC is technically viable. Flag those as you set rules per SKU.

SIOC packaging requirements and eligibility

Before adopting SIOC, you need to know whether your catalog qualifies. The size rule is where most confusion starts.

The minimum eligible package size is 6 x 4 x 0.375 inches, enough to fit Amazon’s shipping label. That’s a floor for eligibility though, not an eligibility guarantee.

Certification pressure comes from the other direction. It applies to larger, heavier, non-sortable items and anything that would otherwise need additional packaging at the fulfillment center. Non-sortable ASINs are those with package dimensions greater than 18″ x 14″ x 8″ or weighing more than 20 lbs.

One legacy claim worth retiring: the idea that any item over $400 automatically requires an overbox. That is not a current Amazon rule and doesn’t appear in current documentation. High value can still be a reason a brand chooses to add protection, but treat it as business judgment, not policy.

Use this framework to assess a SKU:

Fragility and rigidity of the primary package
Product value and theft attractiveness
Weight and dimensions against the size tiers
Leak risk for liquids and gels
Tamper risk and seal integrity
Privacy or discretion needs for sensitive categories
Giftability, where a plain box may be preferred
Current damage and return rates as a baseline diagnostic

When SIOC isn’t the right call, it usually involves fragile, sensitive, or giftable products, plus mixed-cart orders that combine SIOC and non-SIOC items.

ShipBob’s Box Selection Algorithm operationalizes this framework so it isn’t left to associate judgment order by order. It uses machine-captured dimensions and weights to pick the right package for every order. For fragile items, it automatically overrides standard preferences and adds recommended dunnage.

SIOC testing and certification (Self-Test vs. ISTA 6-Amazon)

Certification proves your packaging can survive transit unprotected, and there are two paths, not one. The common claim that testing happens at an Amazon facility is not quite right. Here’s how it actually works:

Self-testing: For eligible rigid, non-fragile items under 20 lbs, brands can run and submit their own physical performance tests.
ISTA 6-Amazon (SIOC) lab test: For everything else, packaging goes through formal lab testing.

Who performs the testing?

Lab tests run through Amazon’s APASS network. APASS stands for Amazon Packaging Support and Supplier, a roster of approved third-party labs that perform the certification testing. An APASS lab performs the test, not Amazon itself.

The packaging certification standard for SIPP is the same as the old SIOC standard, and the rename didn’t loosen the engineering bar. The lab test is still called ISTA 6-Amazon (SIOC), which is why SIOC terminology persists under the SIPP umbrella.

What the test evaluates

The test evaluates the package against the durability principle through a sequence of drop, compression, and vibration or impact checks that simulate parcel handling. Passing means the retail package protects the product on its own.

The cost of skipping certification

Now the timely part. Small and large bulky products that aren’t enrolled in SIPP incur additional packaging fees from $1.51 to $4.04, depending on weight. Only about 12% of Amazon shipments globally use SIPP, so the vast majority of eligible brands are leaving margin behind. That gap is the clearest reason to certify now.

Execution after certification

Certification is the brand’s job. Consistent execution against Amazon’s labeling and barcode standards at pack time is where a fulfillment partner carries the load.

ShipBob’s FBA prep, FBM fulfillment, and EDI-automated retail distribution are built to keep shipments compliant and avoid chargebacks.

One practical detail: place the carrier label so it stays clear of retail barcodes and product information. Overlapping codes cause scan conflicts at the fulfillment center, so design labeling space into the package instead of fighting over it later.

How much could your business save with SIOC packaging?

The honest answer is that savings vary by SKU, so it helps to break them into levers rather than promise a generalized percentage. Many brands overspend on packaging by shipping prepackaged products inside corrugated boxes or poly mailers that add nothing but cost.

Here’s where the money moves when you switch a qualifying SKU to SIOC:

Materials: the outer box and void fill are eliminated
Dimensional weight: a smaller cube lowers the billable parcel rate
Pack labor: fewer touchpoints and no void-fill step
Procurement: less shipping-supply inventory to store and reorder
Amazon fees: avoided packaging service fees on bulky, non-SIPP units

Fragile items like jewelry, cosmetics, and glassware still need protective material for safe delivery. But durable goods such as apparel or work boots rarely need double-boxing, and skipping it stops the cost from stacking.

Packaging is one lever; shipping distance is the other.

ShipBob’s Inventory Placement Program compounds SIOC savings. Its AI Decision Engine distributes inventory across the US network by historical demand and customer geography, which cuts the number of zones an order crosses.

Skincare brand goPure saw the effect clearly, saving roughly $3 per shipment and shipping 57% faster after spreading inventory across three fulfillment centers.

“By letting ShipBob handle physically distributing our inventory for us across their hub-and-spoke fulfillment center network, we’re actually saving money. We’ve seen that shipping to customers is $3 cheaper on average using IPP compared to similar 3PLs’ services, which is a huge upside.” Oscar Gutierrez, Operations Fulfillment Manager at goPure

“By letting ShipBob handle physically distributing our inventory for us across their hub-and-spoke fulfillment center network, we’re actually saving money. We’ve seen that shipping to customers is $3 cheaper on average using IPP compared to similar 3PLs’ services, which is a huge upside.”

Oscar Gutierrez, Operations Fulfillment Manager at goPure

Not on Amazon? Your business can still use SIOC packaging

Your business doesn’t have to ship with Amazon to follow the SIOC model. The same durability principle and eligibility criteria apply on any channel.

If the product’s own packaging can survive parcel transit unprotected, it can ship as its own container.

ISTA testing is still worth running even without Amazon certification, as an internal validation step that tells you whether a package will hold up before you commit a full production run.

Requirements do shift by channel, though. Amazon FBA enforces SIPP through fees and chargebacks. FBM and pure DTC leave the standard to you. Marketplaces like Walmart Marketplace and retail dropship programs carry their own packaging and labeling rules.

You’ll also want to think about returns. When the product box is also the shipping box, you have to decide whether that box can survive a round trip or whether customers need separate return packaging. For fragile or premium items, a return-specific solution usually protects both the product and the resale value.

Scaling SIOC across outsourced, in-house, and global fulfillment

The moment a brand ships from more than one location, packaging logic drifts. That produces uneven damage rates, an inconsistent customer experience, and unpredictable cost per order.

Holding the rule steady across every node is the real challenge, and it plays out differently across three fulfillment models.

Outsourced fulfillment

Across outsourced fulfillment, SKU-level packaging rules are enforced at every fulfillment center in the network. A SIOC item ships the same way whether it leaves Texas or Pennsylvania.

“We were just recently running a bunch of different inserts and were able to handle the majority of that on our end via ShipBob’s tagging rules. All I have to do is go into ShipBob’s Rules Engine, and create a rule that says, “If an order has this tag, add an insert.” I’ve never seen that before where our fulfillment partner can operate similar to how we run marketing email campaigns with tags and rules. We also use ShipBob’s Rule Engine to implement custom packaging elements, like custom dividers and bubble wrap. I’ll create a rule on my end where every time a certain candle comes on an order, ShipBob knows to put the ordered items in a specific bag. It’s all quick and easy, and we can aways change rules on the fly as our business changes.” Rachel Tannenholz, President of Aroma360

“We were just recently running a bunch of different inserts and were able to handle the majority of that on our end via ShipBob’s tagging rules. All I have to do is go into ShipBob’s Rules Engine, and create a rule that says, “If an order has this tag, add an insert.” I’ve never seen that before where our fulfillment partner can operate similar to how we run marketing email campaigns with tags and rules.

We also use ShipBob’s Rule Engine to implement custom packaging elements, like custom dividers and bubble wrap. I’ll create a rule on my end where every time a certain candle comes on an order, ShipBob knows to put the ordered items in a specific bag. It’s all quick and easy, and we can aways change rules on the fly as our business changes.”

Rachel Tannenholz, President of Aroma360

In-house and hybrid operations

For brands running their own warehouse, ShipBob WMS enforces those rules through pack-station logic, SKU-level flags, and exception handling. Associates follow the system instead of memory. Hybrid brands split volume between their own facility and outsourced fulfillment while keeping one packaging ruleset synchronized across both.

This is where partnering with a provider that’s more than a traditional 3PL is particularly valuable: the same technology runs whether you outsource, self-operate, or do both.

“ShipBob’s hybrid fulfillment solution – which allows us to simultaneously outsource fulfillment to three of ShipBob’s fulfillment centers and use ShipBob’s warehouse management system (WMS) to power operations in our Miami warehouse – turned out to be just what we needed. It gave us the inventory storage and operational capacity we needed to keep up with our growing order volume, and since all of ShipBob’s warehouses run on the same WMS we’re using in our facility, we still achieved the unified fulfillment experience we required.” Rachel Tannenholz, President of Aroma360

“ShipBob’s hybrid fulfillment solution – which allows us to simultaneously outsource fulfillment to three of ShipBob’s fulfillment centers and use ShipBob’s warehouse management system (WMS) to power operations in our Miami warehouse – turned out to be just what we needed. It gave us the inventory storage and operational capacity we needed to keep up with our growing order volume, and since all of ShipBob’s warehouses run on the same WMS we’re using in our facility, we still achieved the unified fulfillment experience we required.”

Rachel Tannenholz, President of Aroma360

Geographic considerations

Geography complicates eligibility. Shipping across the US, UK, EU, Canada, and Australia means longer transit distances, different carrier handling, and different recyclability and packaging regulations. Any of those can change whether a SKU stays SIOC-eligible in a given market. A package that passes in one region may need a rethink in another.

“Everybody expects Amazon-level shipping speeds and 2-day or next-day delivery. To provide that to our customers via ground shipping, we need to increase the number of fulfillment centers we use to reduce shipment time. Instead of partnering with a bunch of different providers that each have one or two warehouses, we can just distribute inventory across ShipBob’s dozens of US fulfillment centers. ShipBob’s Inventory Placement Program will even let us send all our inventory to a single hub, and use ShipBob’s algorithms to calculate and automate ideal regional distribution from there. My team wouldn’t have to do it themselves and we can trust ShipBob to get it right, which would be a huge time-saver.” Jessica Cedarleaf, VP of Operations at Tonies

“Everybody expects Amazon-level shipping speeds and 2-day or next-day delivery. To provide that to our customers via ground shipping, we need to increase the number of fulfillment centers we use to reduce shipment time. Instead of partnering with a bunch of different providers that each have one or two warehouses, we can just distribute inventory across ShipBob’s dozens of US fulfillment centers.

ShipBob’s Inventory Placement Program will even let us send all our inventory to a single hub, and use ShipBob’s algorithms to calculate and automate ideal regional distribution from there. My team wouldn’t have to do it themselves and we can trust ShipBob to get it right, which would be a huge time-saver.”

Jessica Cedarleaf, VP of Operations at Tonies

Centralized control and measurement

The ShipBob dashboard acts as the single source of truth here. Packaging preferences get set once at the SKU level and apply consistently across DTC, marketplace, and B2B channels and every fulfillment center.

Auto-Split Rules then re-run each split order through the box selection algorithm, so packaging logic holds even on mixed carts. That answers how to handle an order where one item is SIOC-eligible and another isn’t.

Close the loop with measurement. Track damage rate, return rate, and cost per order segmented by SIOC status and by fulfillment location. That data validates your eligibility calls and shows which SKUs to promote into SIOC or pull back out over time.

Decide if SIOC packaging is right for your business

SIOC packaging still comes down to a few clear decisions: which SKUs qualify, which testing path applies, and how the rule stays consistent as you add fulfillment locations.

Amazon simplified the on-ramp by folding the old programs into SIPP, where SIOC now lives as Tier 2, but the model belongs to any brand that wants less waste and lower cost.

Certification is your job; enforcing it order after order is where a fulfillment partner earns its keep. Handle both well, and SIOC turns into a durable margin advantage rather than a one-time packaging tweak.

For more information on SIOC packaging, and how ShipBob can help you optimize your packaging and shipping costs, click the button below to get in touch.

SIOC packaging FAQs

Here are answers to some of the most common questions about SIOC packaging.

What is SIOC packaging?

SIOC, or “ships in own container,” is packaging designed to lower costs by cutting extra materials and supporting sustainable shipping.

An SIOC item ships in its original packaging without added cushioning or an outer box, and it sits as Tier 2 within Amazon’s SIPP program.

How do you use SIOC packaging?

First design the product’s packaging to meet Amazon’s SIOC and FFP guidelines, then certify it one of two ways. Eligible rigid, non-fragile items under 20 lbs can be self-tested, while everything else needs an ISTA 6-Amazon (SIOC) test through an APASS-approved third-party lab.

Once certified, the item ships as-is with only a shipping label added to the exterior.

Is SIOC packaging eco-friendly?

Yes, SIOC reduces waste by eliminating outer boxes and void fill and by shrinking the cubic volume a shipment takes up in transit.

The program also builds in right-sizing and recyclable-material requirements, especially at the FFP tier. The caveat is that SIOC is only as sustainable as the primary package’s material choices.

What are Amazon’s requirements for SIOC packaging?

The minimum eligible package size is 6″ x 4″ x 0.375″, and the package must survive parcel transit without an overbox.

Certification comes through self-testing for eligible items or an ISTA 6-Amazon (SIOC) lab test via APASS. Larger, heavier, non-sortable items face the greatest compliance and fee exposure.

What is the difference between SIOC and SIPP?

SIPP, Ships in Product Packaging, is Amazon’s seller-side umbrella program. SIOC, ship in own container, is Tier 2 within that program, sitting below Tier 1 FFP. In short, SIPP is the program you enroll in, and SIOC is a certification level inside it.

Who performs SIOC testing, and can I test my own packaging?

You can self-test eligible rigid, non-fragile items under 20 lbs and submit the results yourself. Everything else requires an ISTA 6-Amazon (SIOC) test performed by a third-party lab in Amazon’s APASS network. APASS is Amazon’s roster of approved packaging labs.

Which products should not use SIOC packaging?

Fragile, high-value or theft-attractive, leak-prone, and sensitive or discreet items are generally poor fits, along with giftable products where a plain box hurts the experience.

Mixed-cart orders that combine SIOC and non-SIOC items also complicate packaging. For these, an overbox or protective material is usually the better call.