PACKAGING BUYER GUIDE
Paper Bag GSM: How to Specify Paper Without Guessing Strength
Understand gsm, thickness and finished bag construction before choosing paper for a custom shopping bag.
GSM means grams per square metre: the mass of a given area of paper. It does not directly specify paper thickness or how much a finished bag can carry. Choose paper together with bag dimensions, handles, reinforcement, joints and intended contents, then review a representative finished sample.
What GSM tells you
A paper described as 250 gsm has a nominal mass of 250 grams for one square metre of that paper. It does not mean that a finished bag weighs 250 grams. Cutting, handles, glue and other components affect the finished weight.
Papers with the same gsm can have different thickness, stiffness and surface behaviour. Material type and production properties matter. This guide does not give a universal conversion between gsm and millimetres.
Specify the finished bag, not only the paper
| Detail | Why it matters |
|---|---|
| Contents and weight | Describe the actual items and whether sharp edges, bottles or multiple items are involved. |
| Width × gusset × height | A larger bag is a different construction decision, even when the paper gsm is unchanged. |
| Paper grade and finish | Identify kraft, coated cardstock or another grade; mention lamination or other treatment. |
| Handle and attachment | Specify paper, rope or ribbon handles and how carrying loads reach the bag. |
| Top and bottom construction | Ask about reinforcement and joint details relevant to the intended use. |
| Use conditions | State whether moisture exposure, repeated carrying or long holding periods are expected. |
A practical selection process
- Start with the contents, labelled dimensions and presentation requirements.
- Ask for a paper grade and gsm recommendation, including handle and reinforcement details.
- Review the printed surface and folds on a sample made to the agreed specification.
- Agree how the finished bag will be checked with representative contents, conditions and an acceptance criterion.
If a sample uses a different paper, handle or size, record the difference before treating it as evidence for the final design. A paper swatch alone cannot prove the carrying performance of the finished bag.
A paper selection brief you can reuse
Our bag will hold [contents] with a combined weight of [weight and unit]. Size: width [ ] × gusset [ ] × height [ ], in [unit]. We prefer [paper appearance/finish] and [handle type]. Please recommend a paper grade, gsm and suitable reinforcement, and identify the sample and checking steps needed before approval.
For background on the distinction between grammage, thickness and stiffness, see Holmen’s paperboard technical information. Its material data is general reference, not a GAOGUO bag specification or evidence that GAOGUO uses that supplier’s paper.
Common buyer questions
Is a higher GSM always stronger?
GSM alone cannot establish finished bag strength. Grade, handle attachment, reinforcement, joints and use conditions must also be assessed.
What GSM should I use for a luxury bag?
There is no single luxury specification. Define the size, contents, surface appearance and handle first, then review options and a finished sample.
Can I convert GSM into a bag carrying limit?
No universal conversion is appropriate. Carrying requirements need a finished-bag specification and an agreed check or test.
Next steps for your project
Prepare the RFQ information and review cost drivers before selecting a material.
Explore relevant packaging options · Prepare your RFQ brief · All Buyer Guides