A mailer box is a corrugated shipping box designed to go straight from your warehouse to your customer’s door — no separate shipping carton required. It’s printed on the outside, so the unboxing starts the moment the package lands on the porch, not after it’s cut open.
This guide covers how mailer boxes are built, the closure styles available, common uses, and how to order custom mailer boxes without a case-quantity minimum.
Materials and Construction
Mailer boxes are made from corrugated cardboard, which is rated by ECT (Edge Crush Test) — a 32 ECT board is standard for most ecommerce shipments, while heavier items call for 44 ECT or higher. The corrugated layer gives the box the rigidity to survive transit without a separate outer carton.
The exterior can be printed full-color on white or kraft board, and most mailer boxes ship flat and fold into shape at the point of use, which keeps freight costs down before they’re even filled.
Closure Styles
Tuck-top: The most common style, with flaps that tuck into slots on the front and back panels. Fast to assemble by hand, no tape needed.
Ear-lock (self-locking): Corner tabs lock into slots to hold the lid flat without tape or glue. A step up in security from a basic tuck-top, and still fast to close by hand.
Magnetic closure: A rigid or heavier-weight mailer with a magnetic flap, used for higher-end retail and subscription boxes where the unboxing itself is part of the brand experience.
Common Uses for Mailer Boxes
Mailer boxes are the standard for direct-to-consumer ecommerce shipping, subscription box services, apparel and accessories, and any product where the shipping box and the retail presentation are the same box. If your brand’s unboxing moment happens on someone’s doorstep instead of in a store, a mailer box is probably what you need.
Custom Mailer Boxes — No Minimum Order
Mailer box orders scale with your case-quantity minimum at most suppliers, often 500 units or more before a print run makes sense. That’s a real barrier if you’re a new ecommerce brand testing packaging, or a subscription box that doesn’t want a warehouse full of boxes upfront.
The Best Price Boxes produces custom mailer boxes with no minimum order quantity. Pick your ECT rating, closure style, and print, and we’ll price it to your actual order size, whether that’s a small test batch or a full production run.
Custom Mailer Boxes FAQ
Is there a minimum order for custom mailer boxes?
Not at The Best Price Boxes. We produce custom mailer boxes with no minimum order quantity, so you can order a small test batch or a full production run using the same pricing logic.
What ECT rating should I choose?
32 ECT is the standard choice for most ecommerce products in the 1 to 10 lb range. Go with 44 ECT or higher for heavier items, fragile contents, or long-distance freight where the box takes more handling.
What’s the difference between tuck-top and ear-lock mailers?
Tuck-top flaps simply tuck into slots, which is fast but relies on friction to stay shut. Ear-lock boxes have corner tabs that lock into place, giving a more secure seal for transit without needing tape on either style.
Can I get a sample before ordering in bulk?
Yes. Since there’s no minimum order, a small sample run in your chosen ECT rating, closure style, and print is a normal first order before committing to full production.
