Mailer box vs shipping box: which one do you actually need
A mailer box is a one-piece E-flute corrugated box with a tuck-in lid, printed inside and out and built to be the box your customer opens. A shipping box is a B-flute or C-flute regular slotted carton with taped flaps, built to carry weight and survive a stack. Use a mailer for a single order under about 5 pounds; use a shipping box for heavier, multi-item or bulk shipments, or as the outer carton around a rigid gift box.
What each one is
A mailer box folds from one die-cut sheet of E-flute corrugated into a box with a hinged lid that tucks in and locks at the sides. No tape is needed to close it, the fine flute takes full color print, and it looks finished on a doorstep. Ours run as a kraft mailer box, a white mailer box or a full color printed mailer.
A shipping box is the regular slotted carton, or RSC: four flaps top and bottom, taped shut. Our corrugated shipping box runs on B-flute or C-flute single wall, with BC double wall for anything over 40 pounds. It carries more, stacks better and prints one or two colors on up to three panels.
Side by side
| Mailer box | Shipping box (RSC) | |
|---|---|---|
| Board | E-flute, 32 ECT, kraft or white liner | B-flute or C-flute, 32 or 44 ECT; BC double wall at 48 ECT |
| Closure | Tuck-in lid with side locking tabs, tear strip optional | Taped flaps, hand hole optional |
| One or two color flexo, or full color digital, inside print optional | One or two color flexo on up to three panels | |
| Comfortable load | Up to about 5 pounds | About 30 to 40 pounds per box on 32 ECT single wall; double wall above 40 |
| Sizes we run | 4 x 4 x 2 to 18 x 14 x 8 in | 6 x 6 x 4 to 24 x 18 x 18 in |
| Inside | Die-cut E-flute or paperboard cradle | Corrugated dividers, pads and cradles |
| Minimum | 200 units | 200 units |
| Lead time after proof | 10 to 12 business days (kraft, white); 10 to 14 for full color | 10 to 12 business days |
| What the customer sees | The brand | The carton it came in |
Both ship to you flat. A mailer folds in a few seconds with no tape gun; an RSC needs tape on the bottom before it is packed and on the top after.
How to choose, in five checks
- Weigh the order as it ships. Product, inner packaging, insert and any printed card. Under about 5 pounds, a mailer is comfortable. Above that, the tuck lid starts to work against you and a taped RSC is the safer box.
- Count the items. One or two products in a fixed layout suit a mailer with a cradle. Six bottles, a case of jars or a wholesale reorder belong in a shipping box with dividers.
- Ask whether the box is the experience. If the customer films the opening or keeps the box, it is a mailer, ideally with inside print. If the box goes straight into recycling, spend the money on the product.
- Check what is fragile. Glass and ceramics need an insert that holds them off the walls, in either box. The insert matters more than the flute.
- Check the outside size against carrier rates. B-flute adds about 1/4 inch each way to the outside, double wall closer to 1/2 inch, and carriers bill on the outside. Our subscription sizing guide walks through dimensional weight.
Common shipments and the box that fits
| Shipment | Box | Why |
|---|---|---|
| One 8 oz candle in a glass jar | Candle shipper box | A mailer with a die-cut cradle keeps the jar off the walls; light enough for E-flute |
| A folded tee and a card | Apparel mailer box | Shallow, light, and the opening is the point |
| Two or three wine or spirits bottles | Bottle shipper box | Built-in partitions; a plain RSC would need a separate divider |
| A 24-jar wholesale case | Corrugated shipping box with a 24-cell divider | Weight and stacking, not presentation |
| A rigid gift box sent to a customer | Corrugated shipping box as the outer | The rigid box is the presentation; a printed mailer on top of it is money spent twice |
Where the money goes
We do not publish prices, because the number moves with size, print and quantity, but the drivers are predictable. Full color inside a mailer is the single most visible thing you can do for the unboxing and it costs one extra print pass with no extra lead time. Printing a shipping box in more than two colors is money spent on something that goes in the recycling. Double wall costs more in board and in freight, since the box is heavier and bigger on the outside, so only use it when the weight calls for it.
Sizing the box to the product saves more than any board choice. A box that fits with a finger of clearance needs less void fill, ships in a lower rate band and protects better than a bigger one with the product loose.
When neither is the right box
If the box sits on a shelf and ships inside another carton, you want a folding carton, not corrugated. If the product is a gift that will be kept, a rigid box in a plain shipping outer does the job better than a heavily printed mailer. For the flute details and what each ECT grade is rated to carry, see corrugated flutes and ECT explained, or browse the E-flute corrugated material page.
Questions people ask
Can a mailer box ship on its own with a label on it?
Yes. That is what it is built for. The label goes on the lid or a side panel, and the tuck lid and side locks hold it closed without tape for most parcels. For heavier orders or long trips, a strip of tape across the front tuck is cheap insurance.
Is a mailer box weaker than a shipping box?
For the same weight rating, the board grade is similar; both of ours start at 32 ECT. The difference is the closure and the flute. A tuck lid and E-flute suit a light single order, while taped flaps on B-flute or C-flute carry more weight and stack better.
Can a mailer box be used for retail?
It can sit on a shelf but it is not built for it. A folding carton is thinner, stands better and prints sharper.
What is ECT?
Edge crush test, a measure of stacking strength. 32 ECT is the standard for mailers and light shipping boxes.
Can a shipping box be printed in full color?
On B-flute the flute can show through heavy ink as faint stripes, so we print shipping boxes in one or two flat colors. If you want photographs or full color, use an E-flute mailer instead.
Do I need a tear strip?
For subscription boxes opened every month, it is a nice touch. For gifts, a tuck lid feels better.