Mylar bag sizes for cannabis are named for the flower weight they’re built to hold: a 1 gram bag holds 1 gram, a 1/8 oz bag holds 3.5 grams, a 1/4 oz bag holds 7 grams, a 1/2 oz bag holds 14 grams, and a 1 oz bag holds 28 grams. Start with the labeled size, then adjust for how dense and large your buds are.
Here’s the quick reference most processors and brands work from:
- 1 gram bag: 1 g, for samples and single-gram retail units
- 1/8 oz bag: 3.5 g, the most common retail flower size
- 1/4 oz bag: 7 g, a common mid-size unit
- 1/2 oz bag: 14 g, a value size that also suits smaller buds
- 1 oz bag: 28 g, for ounce units and bulk value tiers
Mylar Bag Sizes for Cannabis: Dimensions and Fill Weights
The dimensions below come from Innovative Sourcing’s product listings. Width is listed first, then height, then the depth of the bottom gusset when fully expanded.
| Bag size | Fill weight | Dimensions (W × H × gusset) | Finishes |
|---|---|---|---|
| 1 gram | 1 g | 3.5″ × 4.3″ × 1.57″ | Black/clear |
| 1/4 oz | 7 g | 4.8″ × 7″ × 2.36″ | Black/clear, kraft/clear |
| 1/2 oz | 14 g | 5.66″ × 8.46″ × 2.36″ | Kraft/clear |
| 1 oz | 28 g | 6.5″ × 10.5″ × 2.36″ | Black/clear, kraft/clear |
Every bag in this lineup shares the same core construction:
- 120 micron film, roughly 4.7 mil, for puncture resistance and a solid barrier
- Gusseted bottom that adds volume and helps the bag stand on a shelf
- Easy-tear tab for a clean first opening
- Pre-punched hang hole for pegboard and slatwall displays
- 1,000 bags per case, with the 1/2 oz kraft/clear bag packed 2,000 per case
See current sizes, finishes, and case pricing in our wholesale Mylar bags category.
What Size Mylar Bag Do You Need for an Eighth?
An eighth (3.5 grams) goes in a 1/8 oz Mylar bag. That size is built to hold 3.5 g of cured, trimmed flower with room left to close the zipper and seal the top. If your eighths are made up of large, intact buds that crowd the zipper, step up to a 1/4 oz bag for more headroom.
The same logic works for every size. Pick the bag labeled for your fill weight, test-fill it with your actual product, and only size up when the flower consistently crowds the closure.
Why Does the Same Weight Fill Bags Differently?
Because weight and volume aren’t the same thing. Two eighths can look very different inside identical bags depending on how the flower was grown, trimmed, and cured. The main factors are:
- Bud density: Compact, heavy buds take up less space per gram than light, airy ones.
- Bud size: One large bud takes up more space than the same weight in smaller pieces, and many brands want intact buds on display.
- Trim: A tight hand trim reduces bulk, while a looser machine trim leaves more leaf and takes more room.
- Moisture: Properly cured flower holds its shape, while overly dry flower crumbles and settles to the bottom.
A practical rule is to leave clear space between the top of the flower and the zipper track. That space keeps buds from being crushed when the zipper is pressed closed and keeps plant material out of the seal area. If the zipper strains on most fills, move up one size. If the product looks lost at the bottom of the bag, a smaller size will give a fuller presentation.
Before a full production run, test-fill a few bags with each product. Weigh it, fill the bag, close the zipper, and look at it the way a buyer would on the shelf.
Black/Clear vs. Kraft/Clear: Which Mylar Bag Finish Should You Choose?
Both finishes pair an opaque panel with a clear window, so buyers can see the product. The choice mostly comes down to brand positioning.
Black/clear bags have a sleek, modern look. The dark panel creates strong contrast behind the flower and frames labels cleanly, which suits premium indoor lines and limited releases. Black/clear is available in the 1 gram, 1/4 oz, and 1 oz sizes.
Kraft/clear bags use a natural brown kraft paper panel. That earthy finish fits craft, small-batch, or sun-grown positioning and brands built around natural, farm-to-shelf stories. Kraft/clear is available in the 1/4 oz, 1/2 oz, and 1 oz sizes.
A few points apply to either finish:
- Light: The clear window lets in some light, so store filled bags away from direct sun and strong display lighting.
- Labels: Test label adhesion on a sample bag before printing a full roll.
- Regulations: Some markets require opaque packaging at the point of sale or an opaque exit bag, so confirm your state’s current rules before choosing a windowed design.
Are Mylar Bags Child-Resistant?
Not automatically. A standard press-to-close zipper keeps flower fresh between uses, but it isn’t designed to keep children out. The stock bags in the table above are not listed as child-resistant, so plan your CR approach separately.
Packaging earns a child-resistant claim through standardized testing under the federal Poison Prevention Packaging Act protocol. Under 16 CFR 1700.15, a package must keep at least 85 percent of a child test panel from opening it without a demonstration, and at least 90 percent of senior adults must be able to open and reclose it. Depending on the state, CR requirements may apply to the primary package or be met with a certified CR exit bag at checkout.
When you plan for child resistance:
- Ask for certification paperwork for the exact bag or container you plan to use.
- Check resealability, since many states expect packaging to stay child-resistant after the first opening.
- Consider a CR primary package, such as glass jars with child-resistant lids, if your market requires it.
- Confirm your state’s rules with your regulator or compliance advisor before finalizing your packaging.
How Do You Heat Seal Mylar Bags?
Seal the bag across the top, above the zipper and below the tear notch, using an impulse sealer. The zipper keeps the bag closed, but the heat seal makes it airtight and tamper-evident. The buyer tears off the sealed strip at the notch on first use and then uses the zipper to reclose.
For a consistent seal:
- Use an impulse sealer with a seal bar wider than your largest bag.
- Test temperature and dwell time on a few empty bags first. A seal that’s too cool will peel apart, and one that’s too hot will warp or burn the film.
- Keep the seal area clean, because kief or small plant fragments in the seal line create weak spots.
- Press out excess air before sealing so the bag sits flat and looks full.
- Inspect every seal for wrinkles, gaps, or cloudy spots, and reseal any bag that doesn’t pass.
Frequently Asked Questions About Mylar Bag Sizes
What size Mylar bag do I need for an eighth?
Use a 1/8 oz Mylar bag. It’s sized for 3.5 grams of cured, trimmed flower with enough headroom to close the zipper and heat seal the top. If your eighths are made up of large, intact buds that crowd the zipper, a 1/4 oz bag gives more room. Test-fill a few bags with your actual product before ordering in volume.
Can I fit more flower than the labeled size?
Often you can, especially with dense flower, but overfilling makes the zipper hard to close, can crush buds, and puts plant material in the seal area. That leads to weak seals and a crowded look on the shelf. If your product regularly crowds the zipper, move up to the next bag size instead of overfilling.
How thick is 120 micron Mylar?
120 microns is roughly 4.7 mil. That gauge gives good puncture resistance and a dependable barrier for retail flower while staying easy to tear at the notch. Every bag size in Innovative Sourcing’s stock Mylar lineup uses 120 micron film, so you get the same protection whether you’re packaging single grams or full ounces.
What are the dimensions of a 1 oz Mylar bag?
Innovative Sourcing’s 1 oz Mylar bags measure 6.5″ wide by 10.5″ tall with a 2.36″ bottom gusset. They’re designed to hold 28 grams of flower and come in black/clear and kraft/clear finishes, packed 1,000 bags per case. Both finishes include an easy-tear tab and a pre-punched hang hole for retail displays.
Can I get custom printed Mylar bags?
Yes. Innovative Sourcing offers custom printing with low minimums, which is a cost-effective way to move beyond stock bags and labels. Custom pricing depends on the print method, number of colors, finish, and quantity. Many brands start with stock bags and labels, then move to custom printed packaging once volume is steady.
Find the Right Mylar Bags With Innovative Sourcing
The right bag protects your flower, presents it well, and keeps your packaging line moving. Innovative Sourcing is a family-owned packaging distributor in Yakima, Washington, serving businesses since 1999. We supply 120 micron black/clear and kraft/clear Mylar barrier bags at wholesale case pricing, and we’ll help you match the right bag to each product.
Request samples to test-fill and seal bags with your own flower before you commit, or call (509) 452-4800 or email sales@innovativesourcing.com to talk through sizes for your lineup.