If you’ve ever browsed packaging specifications and wondered what “120 GSM” or “90 GSM” actually means in practice, you’re not alone. GSM is one of those numbers that gets listed on every product page but rarely explained — and understanding it can save you from ordering something that looks right on paper but disappoints when it arrives.
1. What GSM actually means
GSM stands for grams per square metre. It measures how much a single square metre of the paper or material weighs. The higher the number, the heavier — and generally the thicker and stiffer — the material.
It’s a universal standard used across the paper and packaging industry, which makes it a reliable way to compare products from different suppliers even when they use different brand names for their ranges.
2. How it translates in practice
- 80 GSM — standard office printer paper. Light, flexible, not suitable for bags carrying any real weight.
- 90–100 GSM — entry-level carrier bags and light-duty packaging. Fine for lightweight items like greeting cards, small clothing, or accessories.
- 110–120 GSM — the mid-range sweet spot for most retail carrier bags. Noticeably more substantial; handles everyday retail use comfortably.
- 140–160 GSM — premium retail bags. Stiffer, more structured, carries heavier items confidently. The weight customers associate with quality fashion and gift retail.
- 170 GSM and above — heavy-duty applications: boutique retail, wine bags, or anywhere that a bag needs to carry significant weight or make a strong first impression.
3. GSM affects more than just strength
Weight influences how a bag feels in the hand, how it holds its shape on a counter, and how it looks when filled. A lightweight bag can appear to collapse or crumple around its contents; a heavier bag keeps its structure and presents the product more attractively.
For printed bags, heavier paper also tends to produce sharper, more vibrant results — ink sits better on a denser surface. If your branding relies on bold colour or fine detail, opting for higher GSM is often worth it for print quality alone.
4. Match GSM to your product weight
A simple rule of thumb: the heavier your products, the higher the GSM you need. A bag carrying a pair of jeans and a jumper needs a fundamentally different specification to one carrying a scented candle or a box of chocolates.
If you’re ever unsure, err on the side of heavier. A bag that’s slightly over-specified looks and feels considered. One that distorts or splits under load looks careless — and reflects on the shop that handed it over.
5. Higher GSM costs more — but not as much as you might think
Moving from 100 GSM to 130 GSM typically adds a modest amount to the unit cost — often just a few pence per bag. Spread across a retail transaction, this is rarely a meaningful margin consideration, but the impact on feel and performance is immediately noticeable.
It’s worth requesting samples at different weights before committing to a large order. Holding the options side by side makes the difference obvious in a way that numbers on a spec sheet don’t.
6. GSM applies to tissue paper and other packaging too
It’s not just carrier bags. GSM is used across tissue paper, wrapping paper, card, and other packaging materials. Tissue paper for retail gift wrapping is typically 17–20 GSM — light enough to fold and layer easily. Wrapping paper sits higher, usually 60–80 GSM.
Knowing the GSM of your supporting packaging materials helps ensure consistency across your range, particularly if you’re working with multiple suppliers.
Now you know what to look for
GSM is one of the most useful numbers in a packaging spec, and understanding it takes the guesswork out of ordering. If you’d like help finding the right weight for your products and budget, get in touch with our team or browse our paper bag range — each product lists its GSM so you know exactly what you’re getting.