Custom E-commerce Packaging: Mailer Boxes, Poly Mailers & Unboxing Design (2026)

Your Package Is Your First Physical Impression

DTC customers never walk into your store. They never touch your product before buying it. The first physical interaction they have with your brand is a box arriving at their door.

That box does more marketing per dollar than any digital ad. 40% of online shoppers share unboxing content on social media (Dotcom Distribution, 2025). 52% say premium packaging makes them more likely to reorder. And 78% of consumers have said packaging influenced their perception of the brand (Ipsos, 2025).

Custom e-commerce packaging in the US is a $24 billion market growing at 14% annually. Here's how to do it right.

From our DTC packaging team: The brands that nail unboxing share one thing — they plan the experience in layers. Outer box → tissue paper → product wrap → insert card. Each layer builds anticipation. Each layer costs under $0.50.

E-commerce Packaging Formats

1. Custom Mailer Boxes — The DTC Standard

Mailer boxes are the hero of DTC packaging. They ship flat (saving warehouse space), assemble in 5 seconds, and offer full custom printing on exterior AND interior. Every subscription box from Birchbox to FabFitFun ships in a mailer.

• Construction: E-flute (1.5mm) or B-flute (3.0mm) corrugated, tuck-front closure
• Sizes: Custom-sized to fit your product with minimal void fill
• Printing: Full CMYK exterior + interior printing (the reveal moment)
• Cost: $1.20-$4.50/unit at 5K depending on size
• MOQ: 100 units

2. Poly Mailers — The Lightweight Shipper

Poly mailers cut shipping costs by 50-70% vs. boxes. For soft goods (apparel, accessories, non-fragile products), a custom-printed poly mailer provides branding at a fraction of the box cost.

• Materials: LDPE film (2.5-3.0 mil), recyclable
• Features: Self-seal adhesive strip, tear-resistant, waterproof
• Cost: $0.15-$0.45/unit at 5K
• MOQ: 500 units

3. Branded Shipping Boxes (RSC)

Regular slotted containers for heavier or multi-item orders. Custom-printed kraft or white corrugated with your branding. Works for orders with multiple products or heavier items.

• Construction: 32 ECT single-wall corrugated
• Cost: $1.50-$5.00/unit at 5K depending on size and print coverage

4. The Unboxing Layer: Inserts & Accessories

The box gets them to open it. The inside is what they photograph.

Building the Unboxing Experience

Here's the layered unboxing system most successful DTC brands use:

1. Outer box: Custom mailer box with exterior branding. Cost: $2.50/unit.
2. Tape: Custom printed packing tape sealing the box. Cost: $0.06/box.
3. First reveal: Custom tissue paper in brand color. Cost: $0.10/sheet × 2 sheets.
4. Seal: Branded sticker holding tissue closed. Cost: $0.04.
5. Product presentation: Product in its own packaging or die-cut insert. Cost: $0.35.
6. Personal touch: Thank-you card with discount code for next order. Cost: $0.10.

Total unboxing cost: $3.25/order. That's your customer's first physical brand interaction for the price of one Instagram impression (but way more effective).

Interior Printing: The Revenue-Driving Detail

Interior printing costs $0.15-$0.40 more per box than exterior-only. Here's why it's worth it:

• The interior is what appears in unboxing videos and Instagram photos
• Brand message, social handles, or reorder CTA printed inside drives repeat purchases
• A different interior vs. exterior creates a "surprise" moment that customers share
• 43% of DTC brands with interior printing report higher social media mentions (Arka, 2025)

Shipping Dimensions: Stop Paying for Air

The most expensive thing you ship in e-commerce is air. UPS, FedEx, and USPS all use dimensional weight pricing. A box that's 2 inches too tall costs the same to ship as a box full of product.

• Rule of thumb: Box should be 0.5-1" larger than product in each dimension
• Void fill: If you need more than 2" of void fill, your box is too big
• Right-sizing saves: Reducing box volume by 20% saves $0.50-$1.50 per shipment in dimensional weight charges

Our AI Design Studio can generate a custom dieline based on your exact product dimensions.

Sustainability in E-commerce Packaging

86% of US consumers prefer brands that use sustainable packaging (McKinsey, 2025). DTC brands have an advantage — you control every layer.

• Corrugated mailer boxes: Already 75% recycled content on average. Curbside recyclable everywhere.
• FSC-certified: Available on all our corrugated products at no cost premium.
• Recycled poly mailers: Made from 100% post-consumer recycled plastic. Same durability.
• Paper tape: Replaces plastic tape. Recyclable with the box. $0.02/ft more.
• Acid-free tissue: Recyclable and compostable. No plastic content.

Frequently Asked Questions

What's the cheapest custom e-commerce packaging?

Custom printed poly mailers at $0.15/unit (5K qty). For boxes, a kraft mailer box with 1-color exterior print starts at $1.20/unit (5K). Add tissue paper and a sticker for a complete branded experience under $1.50 total.

How much does a full branded unboxing experience cost?

$2.80-$4.50 per order. That includes custom mailer box ($2.50), tissue paper ($0.20), branded sticker ($0.04), and thank-you card ($0.10). Add a die-cut insert for fragile products (+$0.35). This is competitive with — or less than — the cost of one retargeting ad click.

Should I use interior printing on my mailer boxes?

If your customers share unboxing content: absolutely. Interior printing adds $0.15-$0.40/unit. Brands with interior printing see 40%+ higher social media mention rates. The ROI is measurable in earned media value.

What size mailer box should I order?

Measure your largest product, add 0.5-1" in each dimension for protection, and order that size. Avoid one-size-fits-all boxes — they waste material and cost more to ship. We offer custom sizes starting at 100 units.

Do you offer eco-friendly e-commerce packaging?

Yes. All our corrugated boxes use 75%+ recycled content and are FSC-certified. Recycled poly mailers (100% PCR), paper tape, and acid-free tissue paper are all available. No cost premium on corrugated. Recycled poly costs about 8% more than virgin material.

Build your unboxing experience. Get a quote with your product dimensions and order volume. Or explore all e-commerce packaging options.

Order custom mailer boxes. Custom Mailer Boxes → — branded E-flute corrugated with interior printing. From $0.50/unit, 500 MOQ. Browse all mailer boxes →