Mylar bag sizes are written as width × height, plus a gusset (bottom fold) for stand-up bags. The right size depends on the volume of your product, not only its weight: 3.5 g of dense flower takes far less room than 3.5 g of fluffy flower. Use the charts below as a starting point, then test-fill a blank bag before you print.
Size chart for flower and pre-rolls
| Fill | Typical bag (W × H) | Gusset | Common style |
|---|---|---|---|
| 1 g / single pre-roll | 3 × 4 in | None | Flat pouch |
| 3.5 g (⅛ oz) | 4 × 6 in | None to 1.5 in | Flat or stand-up |
| 7 g (¼ oz) | 5 × 8 in | 2 in | Stand-up |
| 14 g (½ oz) | 6 × 9 in | 3 in | Stand-up |
| 28 g (1 oz) | 7 × 10 in | 3 in | Stand-up |
| 1 lb | 12 × 16 in | 4–5 in | Stand-up |
Need eighths printed per strain? See custom 3.5 gram mylar bags and child-resistant mylar bags.
Size chart for food, coffee and edibles
| Fill | Typical bag (W × H) | Gusset | Notes |
|---|---|---|---|
| 10–20 gummies | 4 × 6 to 5 × 7 in | 1.5–2 in | Zipper for resealing |
| 2 oz loose tea | 5 × 8 in | 2 in | Window optional |
| 8 oz coffee | 5 × 8 in | 3 in | Degassing valve |
| 12 oz coffee | 6 × 9 in | 3.5 in | Degassing valve |
| 1 lb coffee | 7 × 11.5 in | 4 in | Degassing valve |
| 1 gallon dry storage | 10 × 14 in | None | Heavy gauge, heat seal |
How to read and measure a mylar bag size
- Width is measured across the bag, side seal to side seal.
- Height runs from the top edge to the bottom. On stand-up bags it includes half the gusset.
- Gusset is the folded bottom panel that opens to let the bag stand. A bigger gusset adds a lot of volume.
- Seals and zippers take space. Side seals use about ⅜ inch each, and a zipper plus the heat-seal area above it uses about 1–1.5 inches at the top. Usable space is smaller than the outside size.
Thickness (mil) and barrier
Retail pouches are usually around 3.5–5 mil, which balances barrier and feel. Long-term food storage bags are thicker, often 5–7 mil. Thicker isn't always better: the foil or metallized barrier layer does most of the work against light, oxygen and odor. Learn more about the film on our Mylar material page.
Always test-fill before you print
- Order or ask for a blank bag in your candidate size.
- Fill it with real product at your target weight.
- Check that the zipper closes without pinching product, and that the bag stands (for stand-up styles).
- Leave at least an inch of headspace below the zipper.
Choosing between flat and stand-up
Flat pouches are cheaper and suit small fills, pre-rolls and display boxes. Stand-up pouches sit on a shelf on their own, hold more, and give a larger front panel for branding. For anything from 7 g up, stand-up is the usual choice.
Common questions
What size mylar bag do I need for an ounce?
A 7 × 10 inch stand-up bag with a 3 inch gusset fits 28 g of most flower. Very bulky flower may need 8 × 12 inches. Test-fill first.
Do mylar bags block smell?
The barrier film blocks most odor, but the seal matters as much as the film. Close the zipper fully and heat-seal above it for retail, and the bag stays smell-proof until opened.
Can I get a custom size?
Yes. Custom printed bags can be made to any width, height and gusset. A custom size makes sense when standard bags leave too much empty space or don't fit your display box.
Does a window change the size I need?
No. A window doesn't change capacity, but it does change what shows, so check that your product sits where the window is when the bag stands.
Are child-resistant bags a different size?
Child-resistant zippers are slightly wider than standard ones, so they take a little more of the top of the bag. Leave extra headspace when you choose the size.
Order custom printed mylar bags
We print custom mylar bags in all the sizes above and in custom sizes, with resealable or child-resistant zippers, windows and holographic or matte finishes. Most designs start at 100 units. Request a quote with your fill weight and we will recommend a size.