Corrugated Mailer Boxes

Corrugated mailer boxes are folding shipping boxes built from fluted corrugated board instead of flat cardboard, giving them the crush resistance and stacking strength that flat-panel mailers can’t match. They’re the go-to choice when a shipment needs to survive a courier network, a warehouse pallet, or a long parcel route without extra outer packaging. Crat Packaging manufactures corrugated mailer boxes at its own US facility, with flute and wall thickness matched to your product weight, full-color printing, and MOQs starting at 100 units.

Why Choose Our Corrugated Mailer Boxes

• Fluted construction for real strength — the corrugated medium between the liner sheets is what gives these boxes their stacking and crush resistance, unlike single-layer cardboard mailers.
• Flute type matched to your product — E-flute for lightweight, detail-printed items; B-flute for heavier or stacked shipments that need more cushioning and rigidity.
• Single-wall or double-wall options — double-wall corrugated adds a second fluted layer for extra-heavy or fragile shipments that need maximum protection.
• Self-locking, tape-free assembly — roll-end and tuck-style closures fold and lock without tape, cutting pack-out time and secondary materials.
• Full CMYK printing inside and out — unlimited colors at no extra charge, with matte or gloss lamination, spot UV, and foil finishing available.
• Recyclable, US-sourced board — corrugated cardboard produced domestically and fully recyclable after use.
• Custom inserts and dividers — corrugated or foam inserts keep multiple items, glass, or ceramics from shifting during transit.

Specifications

Customization Options

Flute & Wall Thickness

E-flute corrugated cardboard is roughly 1/16″ thick and gives the cleanest print surface, making it the standard choice for apparel, cosmetics, and books. B-flute, at roughly 1/8″ thick, trades some print detail for meaningfully more crush resistance — the right call for canned goods, bottles, and anything shipped in bulk or stacked on a pallet. For extra-fragile or heavy items, we can build double-wall corrugated boxes that combine two fluted layers for maximum protection.

Sizes

Corrugated mailer boxes are die-cut to your exact product dimensions rather than pulled from a fixed size chart, so you’re not paying to ship excess air or risking a product that shifts inside an oversized box.

Printing & Finishing

Full CMYK printing covers the box inside and out at no added color cost. PMS spot colors keep your brand palette exact across runs, and matte or gloss lamination, spot UV, foil stamping, and embossing/debossing all add a premium finish on top of the corrugated structure.

Inserts & Add-Ons

Corrugated or foam inserts and dividers hold multiple items, glass, or ceramics in fixed positions so nothing shifts or collides in transit. Window cutouts let a product show through the box itself for retail-facing shipments.

Industries & Use Cases

E-commerce and warehouse fulfillment operations rely on corrugated mailer boxes for their strength-to-weight ratio when parcels move through multiple sorting hubs. Subscription box companies and gift brands use them to protect multi-item sets across long shipping routes, while beauty, food, and beverage brands use B-flute or double-wall builds to protect glass bottles and jars. Manufacturers and B2B distributors also use corrugated mailer boxes for bulk product shipments where stacking strength during warehouse storage matters as much as transit protection.

How to Order

1. Send us your product dimensions, approximate weight, and target quantity for a free quote.
2. We recommend a flute type and wall construction based on your product’s weight and fragility.
3. Our design team builds a free dieline and digital proof — physical samples available on request.
4. Approve the proof and production begins, running 10–15 business days standard or 8 days expedited.
5. Boxes ship flat-packed to keep freight costs down and assemble quickly on your line.

Why Wholesale Buyers Choose Crat Packaging

Crat Packaging produces corrugated mailer boxes at our own US facility, so flute grade and box strength stay consistent from your first order to your thousandth. There are no setup, plate, or die-cut charges, design support is free, and the minimum order is 100 units — enough to validate a size and flute combination before committing to volume. Bulk pricing starts from around $0.75 per unit, depending on size, material, quantity, and finishing.

Frequently Asked Questions

What’s the difference between corrugated and regular cardboard mailer boxes?

Corrugated board has a fluted (wavy) layer glued between two flat liner sheets, which is what gives it crush and stacking resistance. Plain cardboard — sometimes called chipboard or paperboard — is a single flat sheet with far less structural strength, so it’s better suited to light, low-protection packaging rather than shipping.

What flute type should I choose for my product?

E-flute (about 1/16″ thick) suits lightweight items under roughly 20-25 lbs and gives the sharpest print detail. B-flute (about 1/8″ thick) handles heavier or stacked shipments up to roughly 30-40 lbs. For particularly heavy or fragile products, double-wall corrugated combines two fluted layers for extra protection.

How much weight can a corrugated mailer box hold?

It depends on the flute and wall construction. Standard single-wall corrugated at around 32 ECT typically handles items from a few ounces up to roughly 30-40 lbs depending on flute type; heavier loads should move to a double-wall build, which we can spec based on your product weight.

Are these boxes recyclable?

Yes. Our corrugated cardboard is sourced and produced in the US and is fully recyclable, which most curbside recycling programs accept as standard cardboard.

Can corrugated mailer boxes be printed on the inside as well as outside?

Yes. Full CMYK printing can cover both the exterior for shelf and shipping impact and the interior for a branded reveal when the box is opened — let us know at the quote stage so we can price the extra print pass.

What’s the minimum order quantity?

Our minimum order is 100 units with no setup, plate, or die-cut charges added. Pricing improves at higher volumes.

Do these boxes need tape to close?

Not with our roll-end or tuck-top style closures, which are self-locking and tape-free when the box is sized and cut correctly for your product weight. Tape is only needed if the box is overfilled or unusually heavy for its flute grade.

Need a corrugated mailer box built to survive your actual shipping route? Get a free quote from Crat Packaging today.