What size jar for an eighth? A 2oz or 3oz glass jar fits an eighth (3.5 grams) of cannabis flower. Use the 2oz jar for dense, compact buds and the 3oz jar when buds are larger or airier. For a quarter, step up to a 4oz or 5oz jar, and for a full ounce, use a 10oz or 18oz jar.
Here’s the quick reference, based on the flower capacities listed for each jar in Innovative Sourcing’s catalog:
- Eighth (3.5 g): 2oz jar for dense flower, 3oz jar for larger or airier buds
- Quarter (7 g): 4oz jar as the everyday choice, 5oz jar for larger buds
- Half ounce (14 g): 5oz jar for dense flower, 6oz tall jar for more room
- Ounce (28 g): 10oz jar for dense flower, 18oz jar for maximum room and shelf presence
Jar sizes describe liquid volume, while flower is sold by weight, so the two numbers won’t match. A 2oz jar doesn’t hold two ounces of cannabis. It holds roughly an eighth.
Cannabis Jar Sizes Chart: 2oz Through 18oz
The flower capacities below come from Innovative Sourcing’s product listings. Because bud density varies, treat each range as a practical guide rather than a fixed rule. Every jar is made from clear flint glass and includes a black or white child-resistant lid.
| Jar size | Flower capacity | Typical SKU fit | Neck finish |
|---|---|---|---|
| 2oz | 3.5 – 5 g | Eighths of dense flower | 50/405 |
| 3oz | 3.5 – 7 g | Standard eighths, small quarters of dense flower | 50/405 |
| 4oz | 7 – 10 g | Quarters | 50/405 |
| 5oz | 7 – 14 g | Quarters of larger buds, half ounces of dense flower | 50/405 |
| 6oz tall | 14 – 18 g | Half ounces | 50/405 |
| 10oz | 14 – 28 g | Ounces of dense flower, large half ounces | 57/405 |
| 18oz | 28 – 50 g | Full ounces with room to spare, display and bulk jars | 78/405 |
A few details make this lineup easier to manage on a production floor:
- Shared neck finish: The 2oz, 3oz, 4oz, 5oz, and 6oz jars all use a 50/405 neck finish, so one lid size covers five jar sizes.
- Larger formats: The 10oz jar uses a 57/405 finish and the 18oz jar uses a 78/405 finish, so order lids specific to those sizes.
- Straight-sided profiles: Straight walls make labeling simple and give a uniform look on the shelf.
- Case packs: 200 jars per case for the 2oz, 150 for the 3oz, 100 for the 4oz and 5oz, 50 for the 6oz, 36 for the 10oz, and 24 for the 18oz.
Compare every size and current pricing in our CR glass jars for cannabis category.
What Size Jar Do You Need for an Eighth?
A 2oz or 3oz jar. The 2oz jar holds 3.5 to 5 grams, so it fits an eighth of dense flower with a full look. The 3oz jar holds 3.5 to 7 grams, which gives larger or airier buds more room without crowding the lid.
If your menu includes both dense and airy flower, it’s common to carry both sizes for eighths. Since the 2oz and 3oz jars share the same 50/405 neck finish, one lid size covers both.
What Size Jar Holds a Quarter or Half Ounce?
For a quarter (7 grams), the 4oz glass jar with CR lid is the everyday choice, holding 7 to 10 grams. The 5oz jar holds 7 to 14 grams, so it works for quarters of large buds or half ounces of dense flower.
For a half ounce (14 grams), use the 5oz jar when flower is dense or the 6oz tall jar, which holds 14 to 18 grams, when you want more headroom. The 10oz jar also works for oversized half ounces.
What Size Jar Holds an Ounce?
A 10oz or 18oz jar. The 10oz jar holds 14 to 28 grams, so it fits an ounce of dense, compact flower. The 18oz jar holds 28 to 50 grams, giving a full ounce plenty of room and a bold display profile. It also works for bulk and display jars.
Why Does Bud Density Change the Right Jar Size?
Because two eighths can weigh exactly the same and take up very different amounts of space. That’s why every capacity in the chart is a range. The main factors are:
- Bud density: Compact, heavy buds fill less of the jar than light, airy ones.
- Bud size: Large whole buds take up more space than the same weight in smaller pieces, and they’re the buds buyers most want to see intact.
- Trim style: A tight hand trim reduces bulk, while a looser machine trim leaves more leaf behind.
- Cure and moisture: Properly cured flower holds its shape, while overly dry flower crumbles and settles.
The goal is a jar that looks full without forcing the lid closed. Buds pressed against the lid can be crushed when the cap is turned down. A few buds rattling around an oversized jar can look underfilled, even when the weight is accurate.
Before a large order, test-fill a few jars with each product. Weigh the flower, place it in the jar without packing it down, close the lid, and look at it from the buyer’s point of view.
A Specialty Option: The 2oz Pre-Roll Jar
Not every 2oz jar is built for loose flower. The 2oz pre-roll glass jar has a tall, narrow shape designed for single pre-rolls and multipacks. It keeps pre-rolls upright and protects them from bending, which is a common problem in short, wide containers.
- Capacity: Ideal for multipacks of 6 to 10 pre-rolls
- Lid: Black CR-certified cap with a PE liner for an airtight seal
- Design: Tall and straight-sided for labeling and display
- Case pack: 168 jars per case
The pre-roll jar is a premium alternative to pre-roll tubes for top-shelf multipacks, sampler packs, and brand sets.
Choosing Child-Resistant Lids for Glass Jars
Most regulated cannabis markets require child-resistant packaging, and for glass jars that requirement is met at the lid. CR lids typically use a push-and-turn mechanism that requires an adult to press down while turning. Every flower jar in the Innovative Sourcing lineup includes a black or white CR lid.
- Color: Black lids create a bold contrast against clear glass, while white lids give a clean, minimal look.
- Neck fit: Match the lid to the neck finish. The 50/405 lid fits the 2oz through 6oz jars, while the 10oz and 18oz jars take their own lid sizes.
- Documentation: Ask for CR certification for the exact jar and lid pairing you plan to use, and confirm your state’s rules with your regulator or compliance advisor.
- Custom options: Custom lids and logo printing are available on request through our custom packaging team.
Flint glass gives buyers a clear view of color and structure, and the jars are reusable and recyclable. Because clear glass lets in light, store filled jars away from direct sunlight and strong display lighting.
Frequently Asked Questions About Cannabis Jar Sizes
What size jar do I need for an eighth?
A 2oz or 3oz glass jar fits an eighth (3.5 grams) of cannabis flower. The 2oz jar holds 3.5 to 5 grams and suits dense buds, while the 3oz jar holds 3.5 to 7 grams and gives larger or airier buds more room. Both use the same 50/405 neck finish, so one CR lid size covers either jar.
What size jar holds a quarter ounce?
A 4oz jar is the most common choice for a quarter (7 grams), holding 7 to 10 grams of flower. If your buds are large or airy, a 5oz jar holds 7 to 14 grams and gives them more room. A 3oz jar, which holds up to 7 grams, can work for a quarter of very dense flower.
What size jar holds an ounce of flower?
A 10oz jar holds 14 to 28 grams, so it fits an ounce of dense, compact flower. For more headroom, the 18oz jar holds 28 to 50 grams, giving a full ounce plenty of room and a stronger shelf presence. The 18oz jar also works well for bulk and display jars.
Does a 2oz jar hold two ounces of cannabis?
No. Jar sizes refer to liquid volume, not the weight of the flower inside. A 2oz glass jar holds roughly 3.5 to 5 grams of cannabis flower, which is about an eighth. That’s why it’s best to choose jars by the flower capacity listed for each size rather than the number in the jar’s name.
Can one lid fit several jar sizes?
Yes. The 2oz, 3oz, 4oz, 5oz, and 6oz jars share a 50/405 neck finish, so a single CR lid size fits all five. The 10oz jar uses a 57/405 finish and the 18oz jar uses a 78/405 finish, so those sizes need their own lids. Standardizing on the 50/405 jars simplifies lid inventory.
Get the Right Glass Jars for Every SKU
The right jar protects your flower, shows off its quality, and keeps your packaging line consistent from eighths to ounces. Innovative Sourcing is a family-owned packaging distributor in Yakima, Washington, serving businesses since 1999. We carry flint glass jars from 2oz through 18oz, each with a child-resistant lid, plus a purpose-built 2oz pre-roll jar, all at wholesale case pricing with pallet quantities available.
Request samples to test-fill jars with your own flower before placing a full order, or call (509) 452-4800 or email sales@innovativesourcing.com to find the right jar for every product on your menu.