The best mylar bag for weed is a 4 to 5 mil multi-layer barrier pouch with a heat-seal strip above a resealable zipper, sized by weight (3.5g, 7g, 14g, 28g), matte finish, opaque or with a small window. That covers 90 percent of flower sold in licensed stores. The other 10 percent needs something more specific: a certified child-resistant zipper, a heavier gauge for long storage, a die cut shape for shelf presence, or a pound bag for wholesale. Here are the seven types worth knowing, what each one is for, and what they cost.
1. Standard 3.5g stand-up pouch: the default
A gusseted stand-up pouch in 3.5 to 4 mil film with a zipper and tear notch. Holds an eighth with room to heat seal. Stands on a shelf, fits in a pocket, and it's the cheapest per unit because every supplier runs them by the million. Matte black and matte white are the stock colours. If you're not sure what you need, this is it.
Best for: eighths of flower, first runs, dispensaries labelling in-house
Thickness: 3.5 to 4 mil
Stock price: roughly $0.08 to $0.15 per bag by the case; $0.15 to $0.35 printed at 5,000
2. Heavy-gauge smell-proof bag: for storage, not just sale
Same shape, thicker film: 5 to 7 mil, sometimes with a foil layer. The extra thickness doesn't make it more smell-proof when sealed (any properly heat-sealed mylar blocks smell) but it holds up to months of opening and closing, and the foil layer blocks light better than metallised film. Worth it for slow-moving SKUs, edibles, and anything with a long shelf life.
Best for: long storage, edibles, pre-ground, pound-and-down
Thickness: 5 to 7 mil
Stock price: roughly $0.15 to $0.30 per bag; more printed
If you're wondering whether the zipper alone keeps smell in, it doesn't. Are mylar bags smell-proof? explains why the heat seal is the part that matters.
3. Certified child-resistant bag: required in most licensed markets
A standard barrier pouch with a child-resistant zipper that has passed CPSC 16 CFR 1700.20 testing. The zipper needs a pinch-and-slide or two-handed motion to open. Every licensed US market requires the retail package to be child-resistant, and in most states a CR bag counts as the package. The tell that it's genuine is the test report; a "CR-style" bag without one is a normal bag with marketing.
Best for: any retail flower or edible in a licensed state
Thickness: 4 to 5 mil
Stock price: roughly $0.18 to $0.40 per bag; $0.25 to $0.55 printed at 5,000
More on what certified means on our child-resistant packaging page.
4. Window bag: when the flower sells itself
A stand-up pouch with a clear strip or panel so the buyer can see the bud. Popular with craft growers and for top-shelf strains. The trade-off is light: the window lets it in, so window bags are for product that moves in weeks, not months. Keep the window narrow and the rest of the film opaque.
Best for: top-shelf flower with quick turnover, deli-style counters
Thickness: 4 mil
Stock price: roughly $0.12 to $0.22 per bag
5. Custom printed bag: the one people actually remember
Any of the above with your artwork printed edge to edge instead of a label stuck on. Matte lamination reads premium; gloss reads loud; soft-touch reads expensive and scratches. The jump in price from stock to printed is smaller than most brands expect at 5,000 units, and it's the difference between a bag and a brand. Custom sizes and CR zippers are all available printed.
Best for: brands with more than one SKU and a plan to reorder
Minimum: 5,000 per design is normal
Price: roughly $0.15 to $0.60 per bag at 5,000 depending on film and finish
Details and minimums on custom mylar bags.
6. Die cut bag: shape as branding
A pouch cut into an outline: a jar, a rounded bottle, a character, anything with a closed edge. Same film and zipper as a standard pouch, so it seals and stores the same. It costs more because of the cutting die and the proof step, and it's worth it when the silhouette is doing shelf work a rectangle can't.
Best for: brands that need to stand out on a crowded shelf
Lead time: about 14 business days after proof
Price: roughly $0.25 to $0.70 per bag at 5,000
See die cut mylar bags for how the outline works.
7. Pound and half-pound bag: wholesale and bulk
Large gusseted bags in 5 to 7 mil for 224g and 448g. Usually plain, sometimes with a one-colour print, and often used inside a master case rather than on a shelf. Heat seal every one; a zipper alone on a pound of flower is asking for a leak.
Best for: wholesale transfers, bulk storage, pre-ground
Thickness: 5 to 7 mil
Stock price: roughly $0.40 to $0.90 per bag
How to pick, in three questions
Does your state require child-resistant? If it's the retail package in a licensed market, yes. Start with type 3.
How fast does it move? Weeks: 3.5 to 4 mil is fine, window optional. Months: 5 mil or more, no window.
Do you reorder? If yes, printed pays for itself on the second run. If this is a one-off, stock and a good label.
Whatever you pick, seal it properly. How to seal mylar bags covers the impulse sealer, the temperature and the mistakes that make bags fail.
Quick answers
What thickness of mylar bag is best for weed? 3.5 to 4 mil for flower that sells in weeks, 5 mil or more for storage beyond a couple of months.
Are mylar bags smell-proof? Yes when heat sealed. The zipper alone is not.
What size mylar bag for an eighth? A 3.5g bag, roughly 4 by 6 inches with a gusset. Sizes go by weight, not dimensions.
Do mylar bags for weed need to be child-resistant? In every licensed US market, the retail package does. A certified CR zipper bag with a CPSC test report meets it in most states.
How much do mylar bags cost? Stock 3.5g bags are about $0.08 to $0.15 each by the case. Printed bags at 5,000 units run about $0.15 to $0.60 depending on film and finish.
