Half bottles were once a normal part of a wine shop's shelves and are now a curiosity. The retreat is driven by production economics rather than by any change in what drinkers want.
The cost of filling barely halves
Bottling costs sit mostly in the handling rather than the volume. A closure, a capsule, a label and a moment on the line cost roughly the same whatever size the glass is.
That means a half bottle carries close to a full bottle's fixed cost against half the wine. The price per unit of liquid rises sharply as a result.
Shoppers reading the shelf compare the two prices directly and conclude the smaller bottle is poor value. The producer's honest answer is that it very nearly is.
Bottling lines resist format changes
A filling line is configured for one bottle height and diameter, and switching formats means stopping, adjusting and testing before running again.
For a short run of halves, that changeover can occupy more time than the run itself. Small producers with rented mobile bottling capacity feel this most acutely.
The practical outcome is that halves get made in occasional batches or not at all. Continuity on the shelf disappears even where the intention exists.
Small formats age on a faster clock
The amount of oxygen a bottle admits depends largely on the closure, and that quantity is fixed regardless of how much wine sits beneath it.
A half bottle therefore exposes each measure of wine to proportionally more oxygen than a full bottle does. Development runs quicker and the drinking window closes earlier.
This makes halves unreliable for anything intended to age, which removes them from exactly the category where a smaller commitment would be most useful.
Retail shelves punish the format
Shelf space is allocated by what sells per centimetre, and a short bottle occupying a full slot performs badly on that measure.
Buyers consequently list halves as a token gesture rather than a range. The narrow selection then confirms the impression that nobody wants them.
Restaurants are the exception, since a half bottle solves the problem of two people wanting different wines across a meal. That demand is not large enough to sustain the format alone.
Where the format survives
Sweet wines still appear in halves routinely, because the serving quantity is small and the wine is robust enough to tolerate faster development.
Airlines and hotel minibars keep a thin stream of demand alive, and some producers maintain halves purely as a service to loyal customers.
The wider replacement has been the single-serve can and the smaller bottle formats designed around one pour. They solve the same problem without the awkward economics of glass.