Discovery / Wine Paraphernalia / Wine Closures
Wine Paraphernalia · Follow your curiosity
Wine Closures
Cork has company: screw caps, technical stoppers, crown caps and taps all have a place in the story of keeping wine well.
A little acquaintance, at a glance.
- Traditional material
- Cork oak bark
- Screw cap
- A cap, liner and matching neck
- Sparkling wine
- Closure plus a retaining system
- Other packaging
- Bags, boxes, cans & cartons
The closure is a system
Its job is to seal the package appropriately for the wine and its intended life. The stopper or cap works with the bottle neck and the filling process. Appearance alone cannot tell you how a wine will age, and neither cork nor screw cap is a universal quality grade.
Meet the main families
| Closure | What it is | What to know |
|---|---|---|
| Natural cork | A stopper cut from cork oak bark. | Elasticity provides the seal. Natural variation and the risk of cork-related taint are part of its story. |
| Technical cork | Manufactured using cork particles, discs or other engineered cork constructions. | Different products have different specifications; “technical” does not describe just one design. |
| Synthetic stopper | A manufactured stopper made from polymer materials. | Construction and oxygen performance vary by product. |
| Screw cap | A threaded metal cap with a sealing liner, fitted to a compatible bottle neck. | STELVIN® is a brand of closure system, not the name of every screw cap. Liners can differ in oxygen transmission. |
| Glass stopper | A glass closure with a sealing component and compatible bottle finish. | A distinct system, rather than a cork made of glass. |
| Crown cap | A crimped metal cap. | Common during traditional-method sparkling production; some wines also reach the consumer under crown cap. |
Corks, cages and the sparkling cellar
The cork seals; the muselet, or wire cage, retains it against pressure. The metal plaque spreads the force across the cork. A riddling rack is different equipment: it holds bottles while sediment is moved towards the neck.
Champagne closures evolved from hand-tied string and reinforcing wire. Adolphe Jacquesson patented a protective metal plaque in 1844; metal clips, or agrafes, and later preformed wire cages belong to the wider history. They are not simply decorative souvenirs, even though their plaques have become collectable.
And what about the box?
Bag-in-box is a package, rather than a bottle closure. An oxygen-barrier bag sits inside a protective box and dispenses through a tap as the bag collapses. The film, fittings and tap work together to limit air exposure. Follow the producer’s storage and after-opening guidance; no format stays fresh indefinitely.
Cans, cartons and pouches offer other packaging routes. Judging the wine still requires looking at what it is, who made it and how it has been kept.
A little less closure prejudice
Closure trials show that performance and wine development involve the closure, the wine and packaging conditions together. “Cork means fine wine” and “screw caps prevent ageing” are both poor shortcuts. Read a producer’s reasons where they are available, and let the glass have its say.
A small Cork Dork discovery
Give your curiosity a little room.
Keep an opened cork, screw cap and sparkling-wine cage for a closer look. Identify which part sealed the wine and which part retained or protected it. A box tap offers another example of the same practical question.
Your observations, your words. Small pours welcome.
A few questions worth uncorking.
Is Stelvin the same as every screw top?
No. STELVIN® is a branded closure system. Other screw-cap systems exist.
Does a wire cage create the seal?
No. It holds the cork in place. The cork and bottle-neck fit make the seal.
Can a wine age under screw cap?
Yes. The wine, closure specification and storage conditions determine its development; a screw cap does not make ageing impossible.
Where shall we wander next?
Bottles & Sizes →Barrels & Sizes →Corkscrews & Openers →Wine Preservation →Champagne: The Wine →Dr. Loosen →Behind this introduction
Editorial sources checked 23 October 2026. Composition, production rules and cellar practices can vary by appellation, producer and vintage. The producer’s notes are the place to check a particular bottle.