Kosma jars are the double-walled cosmetic jars you have seen holding thick creams and balms, the ones that feel heavier and more expensive than they look. Kosma is a jar style, not a brand you have to stock: an outer aluminum shell wrapped around an inner glass jar, finished in gloss gold, black, or silver. This guide explains what a Kosma jar actually is, the sizes it comes in, what it holds best, and how it compares to a standard single-wall cosmetic jar, so you can decide whether the weight and the price earn a place in your line.
What is a Kosma jar?
A Kosma jar is a double-wall jar. The part your customer sees is an outer jar made of aluminum, and set inside it is a separate glass jar that actually holds the product. The cap follows the same idea, with an aluminum outer and an inner liner and seal. Between the outer aluminum and the inner glass there is a small air gap.
Three things come out of that construction, and together they are the reason Kosma jars read as luxury:
- Weight. The metal shell gives the jar heft. When a customer lifts it, the weight registers as quality before they have opened anything. Most of the premium feel is right here.
- Finish. The gloss aluminum outer takes a clean, curved, high-shine finish that a plain plastic jar cannot match.
- Seal. The snug lid and inner seal keep the jar airtight, which helps the formula stay fresh between uses.
The outer shell being aluminum matters for more than looks. Aluminium is corrosion-resistant and light for its strength, so you get a protective, durable outer that does not add as much shipping weight as the same shell in glass would.
Kosma jar sizes and colours
Kosma jars come in three sizes and three finishes, which keeps sourcing simple.
- 15 ml: eye creams, samples, and concentrated treatments. Small and precious.
- 30 ml: day and night creams, the everyday face-jar size.
- 50 ml: richer body balms, shea butter, and cleansing balms where the customer expects more product.
Finishes are gloss gold, black, and silver. Pick the one that sits closest to your label and keep it consistent across sizes, so a customer who buys the 15 ml eye cream recognises the 50 ml balm as the same family.
What Kosma jars are good for
Kosma jars are built for formulas you scoop, not pour.
- Thick, scoopable products: balms, salves, shea butter, cleansing balms, and rich anhydrous creams sit perfectly in a wide jar.
- Oil-heavy and fragranced formulas: the inner glass keeps the product off plastic, which is reassuring for balms carrying essential oils or a strong fragrance load.
- Products where presentation is part of the price: a gift-worthy balm or a hero night cream is exactly where the extra weight pays for itself.
Where a Kosma jar is the wrong tool: thin lotions and serums that pour or need daily airless dosing, and any value line where a heavy jar would push shipping costs past what the price can carry. For those, a pump bottle or an airless jar is the better call.
Kosma jars compared to standard cosmetic jars
Here is how a Kosma jar sits against the other cosmetic jars a brand usually weighs up.
| Jar type | Build | Perceived value | Best for | Trade-off |
|---|---|---|---|---|
| Kosma jar | Double wall, aluminum outer, glass inner | High | Balms, rich creams, hero and gift products | Heavier, higher unit cost |
| Single-wall glass jar | One glass wall | Medium to high | Creams and balms on a budget for glass | Heavy to ship, no metal shell |
| PET or acrylic jar | Clear or frosted plastic | Medium | Lightweight lines, travel, value ranges | Reads less premium, plastic contact |
| Airless jar | Plastic with a piston base | Medium to high | Actives and oxygen-sensitive creams | More parts, dosing not scooping |
If your product needs to feel like an investment on a shelf, the Kosma jar wins on first touch. If it needs to ship light and cheap, or dispense an oxygen-sensitive active, look at an airless jar or a pump instead.
Filling, labelling, and refills
Two practical points once the jar is on your bench. First, the inner glass sits below the rim, so fill to leave a few millimetres of headroom, or the seal will smear product across the lid every time the cap closes. A wide jar also means customers look straight down onto the surface, so pour or scrape the balm level, since a tidy top does quiet work for perceived quality.
Second, the curved aluminum shell takes a lid label or a top wrap cleanly, but a full body label has to be cut for the taper, so many brands use a cap label plus a small base sticker rather than fight the curve. And because the inner glass is a separate jar, a Kosma is easy to sell as refillable: offer a refill in a pouch or a plain jar and let the customer keep the metal shell, which is a genuine eco angle rather than a claim on the label.
Ordering Kosma jars wholesale in Canada
Kosma jars are sold by finish and size in set case counts, so you are choosing the colour and the millilitre size, then the pack quantity that matches your batch. Decide the size around your formula first, order a small run to see the weight and finish in hand, then scale the colour that fits your brand.
You can see finishes, sizes, and case counts on the Kosma jars collection, and round out the rest of your range from cosmetic containers in the same order. Minimums are low, pricing is in Canadian dollars with no quote required, and everything ships from Surrey, British Columbia.
The short answer
A Kosma jar is a double-wall jar with an aluminum outer and a glass inner, made in 15, 30, and 50 ml and in gloss gold, black, or silver. The weight and finish do the luxury work, and the inner glass keeps rich, fragranced, or oil-heavy formulas off plastic. Use it for balms and hero creams where presentation is part of the price. Choose a lighter jar when the job is thin lotion, daily airless dosing, or shipping a value line cheaply.
By the Vials.ca team. Vials.ca is the storefront of Hemkund Remedies Inc., a Surrey, British Columbia packaging supplier that has shipped glass and plastic jars, bottles, and vials to Canadian cosmetic and skincare makers for years. Published 11 September 2026.