A supplier of round 300 ml glass beverage bottles should be chosen on one question before any other: is the drink carbonated. Carbonated products need a pressure design of 300 to 340 g verified to at least 8 bar under ASTM C147, while still drinks run safely in a 240 to 280 g bottle with no pressure rating. After that, the finish, the fill process and the supplier's test documents decide whether the bottle works on your line.
Still or carbonated: the two 300 ml designs
A carbonated bottle is a pressure vessel. Drinks at 2.5 to 4 volumes of CO2 hold a sustained internal pressure of 4 to 8 bar, so soda, sparkling juice and kombucha bottles have engineered wall distribution, a pressure-rated finish and an internal-pressure test. The 8 bar minimum leaves a margin for a warm warehouse.
Juice, tea, water and cold coffee need none of this, which is why the still design is lighter. The risk runs one way only. A still-design bottle put into carbonated service can fail, sometimes explosively on the filling line. A pressure bottle used for a still drink is simply heavier than it needs to be.
| Specification | Still beverage design | Carbonated design |
|---|---|---|
| Nominal / brimful capacity | 300 ml / 312–320 ml | 300 ml / 315–325 ml |
| Glass weight | 240–280 g | 300–340 g |
| Body diameter | 62–68 mm | 60–66 mm |
| Finish options | 28 mm ROPP, lug TO, 38 mm screw | 28 mm PCO 1881, crown 26 mm |
| Internal pressure rating | Not rated | ≥8 bar (ASTM C147 verified) |
| Thermal shock (ASTM C149) | ≥42 °C if hot-fill | ≥35 °C typical |
These figures describe the standard round bottle. Cold brew brands often prefer a slim flat-panel shape, covered in our notes on flat 300 ml flask bottles, and other capacities are compared under wholesale glass beverage bottles.
Neck finishes and the closures they take
The finish is the molded glass ring at the mouth that the cap seals against. Four are common at this size.
- 28 mm ROPP (roll-on pilfer-proof). The finish is smooth to begin with, and the capper rolls an aluminum cap onto it, forming the threads in the cap metal. It opens by hand, breaks a tamper band and reseals, which is why juice, tea and wine-cooler formats use it.
- 28 mm PCO 1881. A continuous-thread finish for plastic screw caps, whose sealing lip holds pressure. The 1881 version uses less resin than the older 1810 and is now the default for carbonated soft drinks.
- Crown 26 mm. Needs an opener. Craft soda and kombucha brands choose it for that ritual.
- Lug twist-off. Used for hot-filled, food-adjacent drinks.
Buy the bottle and the closure as a matched pair with the torque window written down, and ask for finish gauge reports, meaning go/no-go ring and plug data, with each shipment. A finish that is 0.3 mm out of gauge loses vacuum without any visible sign, and the fault appears weeks later as flat product.
What the fill process demands of the glass
The filling method limits the bottle choice more than the bottle limits the filling method, so state it at the start of any supplier conversation.
- Hot-fill at 82 to 88 °C. The glass must be thermal-shock verified under ASTM C149 to a 42 °C differential minimum. The closure has to pull a vacuum as the drink cools, and the base and shoulder must take that vacuum without paneling.
- Tunnel pasteurization. Puts the bottle through a second thermal cycle, with the same requirement.
- Cold-fill with preservatives, aseptic fill or HPP. No thermal load, so a lighter bottle can be specified.
- Carbonated lines. Counter-pressure filling tests the pressure rating and the finish on every cycle at line speed. Our guide to bulk soda bottles goes further into the pressure side.
A supplier who never asks how you fill is likely to offer whatever is already on the shelf.
Five documents to ask a supplier for
- Pressure data. Recent ASTM C147 reports for carbonated designs, taken on the actual mold.
- Thermal data. ASTM C149 results that match your fill process, if you hot-fill or pasteurize.
- Tolerances. Weight within ±5 percent, documented brimful capacity, and verticality within 1.5 mm.
- Finish quality. Gauge reports plus cold-end camera inspection of the sealing surface. Cameras catch the finish defects that jam cappers more reliably than manual sorting.
- Packing. Divider cartons, a pallet specification and a written breakage allowance under 0.3 to 0.5 percent.
A supplier who hands over all five without being pressed is one to keep talking to. As a sourcing desk we collect these from the plant before recommending a bottle. To start, send your product type, fill process and target volumes through the quote request form.
Why 300 ml is the common single-serve size
The size works for practical reasons. A 250 ml bottle reads as a sample and anything from 330 ml up starts to look like a sharing pack, so 300 ml feels like one full serving. With 240 to 320 g of glass, a filled bottle weighs about 550 to 620 g, solid in the hand but still easy to carry.
Retail fixtures suit it as well. Cooler racks, shelf depths and six-pack carriers in most markets are sized for the 250 to 330 ml group, so a 300 ml bottle fits existing shelf plans.
Frequently asked questions
Can one 300 ml bottle serve both carbonated and still drinks?
Not safely in both directions. A pressure-rated bottle can hold a still drink, but a non-pressure bottle must never be filled with a carbonated one. Match the pressure rating to the product.
Does the bottle differ for hot-fill and cold-fill?
Yes. Hot-filled bottles, which are usually inverted after capping, face a steep temperature gradient and then a vacuum, so expect slight panel features designed to absorb it without deforming. Cold-filled and HPP products can use a lighter design.
What are typical MOQs and prices for 300 ml beverage bottles?
Both are quoted per project. They depend on whether a stock mold or a new one is used, the pressure class, the closure, the quantity and the freight terms.