Some reusable bags feel solid in your hand and some feel like tissue paper, and we get asked why about once a week. You’ve probably had the cheap kind, two library books go in and the handle starts peeling off, while your neighbor’s bag hauls milk cartons and juice home every Saturday and still looks fine. Most of that gap is one number. GSM.
If you’re buying custom non-woven shopping bags for a store, you’ll be asked for it, so it helps to know what it means before the quote shows up. We’ll go through what the letters stand for, how the weight changes the way a logo bag holds up and prints, and which weight we’d usually pick for what.
What Does GSM Even Stand For?
Grams per square meter. That’s it.
The easiest way we’ve found to explain it is the kitchen scale thing: picture a sheet of bag fabric cut to a square one meter on each side, and you drop that square on a scale, and if the scale says 80 grams then you’ve got 80 GSM fabric (120 grams, 120 GSM, you get the idea). Bigger number, heavier sheet. Usually a tougher bag too, though the handles and stitching matter as well.
Anyone making custom non-woven bags for you is going to want this number up front, and “just a normal bag” doesn’t really tell them much, since a trade show freebie and a grocery tote you’d keep for five years are pretty different animals.
Breaking Down the Different GSM Numbers
Roughly three bands come up when you shop for custom bags. Here’s how we think about each one.
1. Light-Weight Bags (60 GSM to 70 GSM)
Featherweights. Pick one up and it’s floppy, about like a paper medical gown, and it costs very little to make, which is kind of the point.
Good for trade show handouts, a light catalog, one t-shirt, maybe a couple of small jewelry boxes going out of a pop-up. We wouldn’t put anything heavy or pointy in one, though (a corner of a hardcover will go straight through).
2. Standard Retail Bags (80 GSM to 100 GSM)
This is where most shops end up, and if a boutique or shoe store has ever handed you a fabric-ish bag at the register it was very likely in this band.
It has a bit of crispness to it when you open it up, holds a couple of sweaters or a pair of shoe boxes without drama, and it’s still cheap enough to give away with every sale. Logos print sharp on it too. If you’re not sure, honestly, start here.
3. Heavy-Duty Grocery and Box Bags (110 GSM to 150 GSM+)
Heavy stuff. Squeeze one of these and you can feel how dense it is, closer to light canvas, and that’s what you want for grocery runs, wine bottles, a stack of textbooks, or those structured “box bags” with a board in the base.
People hang on to these and keep using them for years, which means your logo keeps getting carried around town long after the sale. Pretty good deal for one bag.
Why Non-Woven Fabric is Different
Quick detour, because “non-woven polypropylene” sounds a lot more complicated than it is.
A cotton tee is woven, threads going over and under on a loom. Non-woven skips the loom. Polypropylene pellets get melted, spun out into long fibers that look a bit like a spider web, and then pressed and heat bonded (sometimes with a chemical binder) into one flat sheet.
Skipping the weaving is what keeps it cheap and fast, and it’s why you see these bags at every farmers market and conference now, it looks and feels like cloth for a fraction of what cotton or canvas would cost, and people actually reuse it. For a first order most shops go with plain non-woven shopping bags or simple D cut bags.
How GSM Affects Your Logo and Printing
Here’s the part people don’t expect. The weight changes how your print looks.
Thin 60 or 70 GSM fabric has a slightly bumpy, loose surface, and fine text in a logo can wrinkle and blur on it. Go up to 90 or 120 and the surface is tighter, screen print and heat transfer lay down flat, and the colors come out brighter. We’d steer anyone with a detailed logo away from the lightest stuff.
And handles. A heavy handle glued onto a thin body is asking for trouble, it’ll tear out the side the first time somebody lifts a full bag off the counter. Heavier fabric gives a die-cut loop or a stitched strap something to grab on to.
Summary: Which One Should You Buy?
Think about what’s actually going in the bag. That’s the whole decision, really.
Trade show giveaway with a flyer inside? Around 70 GSM is plenty.
A clothing shop, boutique or gift store wanting a reliable everyday bag, we’d go 90 to 100.
Groceries, bottles, anything heavy, or a nicer tote you want people to keep, 120 GSM and up.
So don’t just guess when the quote form asks. Check the GSM, it saves you money and keeps your customers’ stuff off the sidewalk.
Related Products and Guides
If you’re working on packaging like this, have a look at custom mailer boxes and product packaging boxes. You might also find these useful: what is gsm in paper packaging: simple, proven chart.