Two board families with different jobs
Paperboard is a single solid sheet, the same kind of board used for cereal and cosmetic cartons. It is thin, smooth and folds into crisp, light boxes.
Corrugated is built in layers. Its strength comes from a rippled middle sheet held between two outer facings.
Each family covers a different range of products. Picking the wrong one either wastes money on board you do not need or lets goods arrive damaged.
Rigid chipboard sits apart from both. It is thick, stiff board wrapped in printed paper, used where the box is part of the gift.
A quick test tells them apart. Look at a cut edge: a solid edge is paperboard, while a wavy line between two sheets is corrugated.
The boards side by side
This table covers every board we use for mailers. Thickness figures are approximate and include the liners.
Most first-time buyers end up in the E-flute row. It balances print quality, protection and parcel size for the widest range of goods.
Thickness also changes the feel in the hand. Paperboard flexes when squeezed, while corrugated pushes back, which customers read as quality.
| Board | Thickness | Suits | Watch for |
|---|---|---|---|
| 18 pt SBS or kraft paperboard | 0.018 inch | Light items under about 1 lb | Crushes under heavy parcels |
| 24 pt SBS or kraft paperboard | 0.024 inch | Light retail sets, cards, minis | Not for glass on its own |
| E-flute corrugated | About 1.5 mm | Most mailers up to several pounds | Stacks less well than B-flute |
| B-flute corrugated | About 3 mm | Heavy, large or fragile orders | Fine print shows flute lines |
| Rigid chipboard | Thick, wrapped | Premium keepsake mailers | Arrives made up, not flat |
Where paperboard makes sense
Paperboard shines for small, light products that travel inside another layer or by letter-sized post. Think lip balm, jewelry, cards, socks and sample sets.
It gives the sharpest print of any board, because its surface is smooth and dense. Fine text down to 6 pt and thin lines print cleanly.
Boxboard mailer boxes in 18 to 24 pt also keep parcels slim. That can drop a light order into a smaller postage size.
The limit is crush strength. Under a pile of heavier parcels a paperboard mailer can dent, so send it alone only with light goods that can take a knock.
Paperboard is also the usual choice for inserts inside a corrugated mailer. Its thin walls make neat cavities for small bottles, tubes and cards.
Where corrugated earns its place
Corrugated is the default for direct-to-customer mailers. The flute acts like a row of small columns that hold the walls apart when something presses down.
Choose it once the packed order passes about 1 pound, or whenever glass, ceramics or electronics are inside. It also suits boxes that ship without an outer carton.
Corrugated mailer boxes in E-flute or B-flute print in full color on a white or kraft liner. The print is a little softer than paperboard, but logos and photos still look sharp.
Corrugated also handles damp better than thin paperboard. A parcel left on a wet doorstep for an hour usually keeps its shape.
Its extra thickness adds a little to the outer size. Keep that in mind if you are trying to stay under a carrier size band.
Subscription boxes and apparel mailers almost always land here. They ship alone, get stacked in vans and still need to look good at the door.
E-flute or B-flute
E-flute is the thinner of the two at about 1.5 mm. It prints well, folds neatly into roll end walls and keeps the box slim.
B-flute is about 3 mm thick and much stiffer. It suits orders over roughly 10 pounds, large boxes with wide panels and cartons that stack in storage.
Large panels are the clue. A box over about 16 inches long in E-flute can bow under a label or a heavy product, while B-flute stays flat.
Brown and white liners work on both flutes. Our printed kraft mailer boxes show how one-color print looks on a brown corrugated liner.
Weight is not the only signal. A light but very large box, such as a bedding set, still benefits from B-flute because long walls need stiffness.
When rigid chipboard is worth it
Rigid boxes feel heavy and solid when picked up. People keep them for storage, which keeps your logo on a shelf for months.
Chipboard mailer boxes with a printed wrap suit launch kits, gift sets and high-value goods. The printed paper is wrapped over the board, so finishes like foil sit on the wrap.
They do have costs. Rigid boxes arrive made up, take far more storage space and usually travel inside a shipping carton.
Some brands mix boards. A rigid gift box sits inside a plain E-flute shipper, so the rigid box arrives clean and unmarked.
Plan the order quantity with storage in mind. A small first run of rigid boxes tests the look without filling your packing room.
How each board handles print and finishes
Every board takes full color CMYK and Pantone printing, inside and out. The differences show in fine detail and in how finishes sit.
Paperboard shows the finest detail and the smoothest gloss or soft-touch lamination. E-flute comes close, and B-flute can show faint flute lines under large solid areas.
Ask for a matte finish if a large dark area sits on B-flute. It softens any flute lines that show through the ink.
- Thin lines and text under 6 pt: paperboard or E-flute.
- Large solid floods of dark color: E-flute with matte or soft-touch lamination.
- Foil stamping and spot UV: all boards, crispest on paperboard and E-flute.
- Embossing and debossing: thicker paperboard, E-flute or rigid wrap.
- White ink on brown: kraft paperboard and kraft corrugated liners.
Protection for fragile goods
Board strength alone does not protect glass. A thick box with the product loose inside still lets it hit the wall on every drop.
Fragile goods need corrugated walls plus an insert that holds the item still. Fragile mailer boxes with fitted inserts keep a small gap between the product and the outer wall.
Paperboard inserts suit light pieces, while corrugated inserts carry heavier jars and ceramics. Both stay in the paper stream for recycling.
Shake a packed sample gently before you approve the build. If you hear movement, the insert or the box size needs adjusting.
Choosing your board in six steps
Work through the steps in order. The first answer that points to a heavier board usually decides it.
Your board choice changes the inside size too, so read our guide to measuring mailer box sizes before you fix the numbers.
Unsure between two rows? Pick the stronger board for the first run. You can step down on a reorder once you see how parcels arrive.
- Weigh one packed order, including any inserts and paper.
- Under about 1 pound and not fragile: start with 18 or 24 pt paperboard.
- Between 1 and 10 pounds, or anything breakable: choose E-flute.
- Over about 10 pounds, longer than 16 inches or stacked high: choose B-flute.
- If the box is a keepsake gift: consider rigid chipboard in a shipping carton.
- Note the board on your quote request, or ask us to suggest one on the proof.
Storage space, cost and lead time
Paperboard and corrugated mailers ship flat and stack tightly. A few hundred flat E-flute mailers fit on one shelf, while the same count of rigid boxes can fill a room corner.
Price depends on board, size, quantity and finish, starting from $0.30 per unit. Your quote shows the exact figure for the board you pick.
Lead time is the same for every board: 4–6 business days after proof approval, then 2–3 business days in transit. You can compare boards in one quote request if you want to see both options.
Corrugated stock keeps best on a dry shelf, off the floor. Paperboard can curl in humid rooms, so store it flat under a light weight if needed.