Paper Thickness & Board Weight Guide for Rigid Boxes
Greyboard thickness is the thickness of the recycled board core inside a rigid box, measured in millimetres (typically 1.5-3 mm); board weight (gsm) describes how heavy one square metre of paper or board is. In rigid box manufacturing the two numbers do different jobs: greyboard thickness sets the structure, rigidity and perceived value of the box, while paper weight sets how the printed wrap looks, folds and feels. Specify both and you get exactly the box you imagined.
Greyboard thickness: what each size is for
| Greyboard thickness | Typical use | How it feels |
|---|---|---|
| 1.0-1.2 mm | Small jewelry and cosmetic boxes, lightweight lids | Light and flexible |
| 1.5-2.0 mm | Standard rigid boxes: cosmetics, supplements, small gifts | Firm, reassuring, premium |
| 2.5 mm | Magnetic boxes, wine and spirits, subscription kits | Solid and substantial |
| 3.0 mm | Large gift sets, corporate kits, luxury limited editions | Heavy and architectural |
The most common mistake is going too thick on a small box. A 3 mm board on a 90 mm jewelry box feels clumsy and makes the lid heavy; a 1.5 mm board on a 300 mm gift set lid bows in the middle. Match the board to the span, not to the budget.
Board weight (gsm): how the wrap is specified
| Wrap material | Typical weight | Character | Best for |
|---|---|---|---|
| Coated art paper | 128-157 gsm | Smooth, vivid print | Full-colour branding and photography |
| Uncoated offset paper | 120-140 gsm | Soft, matte, tactile | Minimalist and natural brands |
| Kraft paper | 100-150 gsm | Fibrous and warm | Eco and artisan positioning |
| Textured / embossed paper | 120-160 gsm | Tactile grain, linen look | Luxury labels and heritage brands |
| Specialty wrap (linen, leatherette) | Fabric, measured in mm | Deep texture, high perceived value | Wine, spirits and VIP sets |
Wrap paper for rigid boxes is usually lighter than you expect: 128-157 gsm art paper is standard because it must fold cleanly around a corner without cracking. Heavier is not automatically better - a 250 gsm sheet will fight the turn-in and show creases.
The common misconceptions
- "Higher gsm means thicker board." Not necessarily. GSM measures weight per square metre; caliper (thickness) depends on bulk and coating. Two 300 gsm sheets can differ by 30% in thickness.
- "Thicker board is always more premium." Above the right thickness for the box size, the extra weight reads as clumsy and raises freight cost for no benefit.
- "Greyboard grade does not matter." It does. Dense, uniform recycled greyboard cuts cleanly, holds magnets and does not warp; cheap board delaminates at the corners.
- "The wrap is just decoration." The wrap carries the print, the finish and the fold quality. Cracking at the corners is almost always a wrap or grain-direction problem, not a board problem.
How board and size work together
A practical starting rule for rigid boxes:
- Up to 100 mm: 1.5-2.0 mm board - light, elegant, easy to open.
- 100-200 mm: 2.0-2.5 mm board - the everyday premium range for cosmetics, supplements and gifts.
- 200 mm and above: 2.5-3.0 mm board to stop lids bowing and base panels flexing under weight.
Then adjust for what is inside: a bottle needs a 2.5 mm wall and a cradle; a lightweight garment needs structure, not mass. If your box carries a heavy insert, thicken the base panel before thickening the lid.
How to write a spec your factory can build
Send these ten lines and there is no guessing on either side:
- External dimensions L x W x H in mm, and whether the height includes the lid
- Box style (magnetic, drawer, lid & base, cylinder) and closure
- Greyboard thickness in mm
- Wrap material and weight in gsm, inside and outside
- Print method and colours (CMYK or Pantone references)
- Finishes (foil colour, emboss/deboss, spot UV, lamination, edge paint)
- Insert type, material and product weight it must hold
- Tolerance, for example +/-1 mm, or +/-0.5 mm for tight-fit lids
- Export carton requirement (units per carton, carton strength)
- Quantity and destination country
Add a photo or 3D file of the product and we will return a free dieline and 3D preview so you can approve the structure before tooling.
Match board to the span, not to the budget: a 2 mm board on a 250 mm lid will bow, and a 3 mm board on a 90 mm box will feel clumsy.
FAQ
Q: What is the standard greyboard thickness for a rigid box?
A: Most premium rigid boxes use 1.5-2.5 mm greyboard. Small boxes start at 1.5 mm; wine, spirits and large gift sets typically use 2.5-3 mm.
Q: What does gsm mean on packaging?
A: Grams per square metre - the weight of the paper or board. It tells you how substantial a sheet is, but not how thick it is. Thickness is measured in millimetres for greyboard and microns for film.
Q: Is a heavier wrap paper better?
A: Not for rigid boxes. Wrap paper must fold around corners without cracking; 128-157 gsm art paper is the industry standard for a clean turn-in.
Q: Can you help me choose the right thickness?
A: Yes - send your product dimensions and weight. We reply within 24 hours with a recommended board, dieline and 3D preview, and samples ship in 5-7 days.
Ready to lock your specification? Send your dimensions and product photo - our engineers reply within 24 hours with a free dieline and dieline-based quote. Get a quote or talk to an engineer.
Structural designers & print specialists, Shenzhen
