Glass storage jars are one of those products where the details really matter. Pick the wrong size and you’re wasting shelf space or cramming product. Pick the wrong glass type and your products degrade from light exposure. Pick the wrong lid and you lose aromatic compounds to evaporation or deal with messy leaks.
I’ve gone through probably a dozen different jar styles over the years helping businesses find the right packaging. Ask me how I know. Here’s what I’ve learned about what actually works.
What Size Glass Jar Works Best for products?
Size depends entirely on the product type and quantity you’re packaging. The most common sizes for products are 5ml, 7ml, and 9ml.
5ml jars are the industry standard for single-gram essences like glass-like storage, soft storage, soft storage, and specialty products. A gram of most beads fits comfortably in a 5ml jar with minimal headspace. Less headspace means less air exposure, which means better preservation of aromatic compounds and potency.
7ml jars work well for slightly larger quantities or for products that are fluffier and take up more volume relative to their weight - think whipped soft storage or sugar soft storage. They also give customers a bit more room to work with a retrieval tool without scraping the sides.
9ml jars are better for two-gram packages or for products with mix-ins like viscous blend that need more volume. They’re also popular for non-botanical essences used in crafting and cosmetics.
The American Packaging Corporation notes that optimal container sizing minimizes headspace to reduce oxidation while providing enough room for product access - a balance that the 5ml format hits particularly well for standard product weights.
Why Does Glass Type Matter for product Storage?
Clear glass lets UV light through. UV light breaks down botanical compounds and aromatic compounds. It’s that simple!
Amber glass blocks approximately 90% of UV light in the damaging 300-450nm wavelength range. That’s why pharmaceutical and botanical industries prefer amber for light-sensitive products. If your products will sit on a retail shelf under fluorescent or LED lighting, amber glass is the right choice.
Cobalt blue glass provides similar UV protection with a different aesthetic. Some brands prefer the distinctive blue look for shelf differentiation.
Clear glass works fine for products that will be consumed quickly (within a week or two of purchase) or stored in dark environments. If turnover is fast and storage is controlled, clear glass is cheaper and lets customers see the product.
What Lid Options Are Available and Which Should You Choose?
The three main lid types for storage jars are screw tops, child-resistant (CR) push-and-turn caps, and silicone-lined lids.
Standard screw tops are the simplest and cheapest option. They work for non-regulated markets or products that don’t require CR packaging. The seal is good enough for short-term storage.
CR push-and-turn caps are legally required for botanical in most states. They add slightly to per-unit cost but keep you compliant. Make sure your CR cap is certified as a complete assembly with your specific jar - the cap and jar must be tested together.
It's worth noting that you'll get better results once you've found what works for your specific setup. Silicone-lined lids create an airtight seal that’s particularly important for aromatic compound preservation. The silicone gasket prevents the micro-leaks that standard plastic or metal lids allow. If freshness and potency retention are selling points for your brand, silicone-lined lids are worth the upgrade!
How Should You Store Essences in Glass Jars for Maximum Freshness?
Temperature, light, and air are the three enemies of product quality. Glass handles the light issue (especially amber glass), but you need to manage the other two.
Store filled jars at room temperature (and yes, precision matters here) or slightly below (60-70°F is ideal). Avoid refrigeration unless the product is specifically formulated for cold storage - temperature swings when moving jars in and out of the fridge cause condensation inside the jar, which degrades the product. For more on this, check out our bulk packaging tips.
Keep jars upright. Products that contact the lid repeatedly can degrade the seal material or pick up off-flavors from the cap lining. Upright storage keeps the product in the body of the jar.
For long-term storage (more than a month), consider heat-shrinking a tamper-evident band around the cap for an additional air barrier.
Picking the Right One Between Bulk and Retail-Ready Packaging?
Bulk jars (sold in cases of 100-500+) are significantly cheaper per unit and make sense if you’re packaging in-house. You’ll need your own labels, caps, and possibly tamper-evident seals.
Retail-ready options come pre-labeled or with custom printing and may include matching CR caps and tamper bands. They cost more per unit but save labor and ensure consistency.
Our glass jars by size collection offers both bulk and smaller quantities, so you can test sizes before committing to a large order. For businesses needing bulk quantities, check our bulk wholesale options.
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Find the right jar for your product in our jars and containers collection. From 5ml storage jars to larger storage options, we carry clear, amber, and specialty glass in multiple sizes with compatible lid options. Need child-resistant? Our CR jars are ASTM D3475 certified and ready to ship. At Kraft & Kitchen, we carry the supplies you need to make every project easier.
