Boxed sets are sized for a household that entertains weekly and washes up in a machine every evening. Most homes are not that household. Working out how many glasses you genuinely need takes ten minutes and saves both money and shelf space, which in a small kitchen is the scarcer of the two.
Count the dirty ones, not the clean ones
The number you need is the maximum you can have dirty at once, plus a small reserve. For two people who run a dishwasher every second day, that is roughly six everyday tumblers, not twelve. Watch your own sink for a week before buying anything and the answer becomes obvious.
Sets are priced to look generous
A set of twelve rarely costs twice a set of six, which is exactly why it exists. The saving is real only if you use them, and the cost of storing six unused glasses for years is not counted anywhere on the box. Buying four now and four later also tells you whether you like the shape before you commit, and browsing individual pieces in a range such as NETANY rather than a bundle makes that easy.
Duplicate function is the usual waste
Most cupboards contain three variations on the same medium tumbler and nothing for a long iced drink. Before adding anything, name the drink it is for and the occasion it is for. If an existing glass covers both, you are buying a colour change rather than a capability.
Where a larger number does make sense
Shared houses, families with teenagers, homes without a dishwasher, and anyone who hosts a dozen people several times a year all genuinely need depth. Even then, cheap sturdy tumblers for volume and a small number of nicer ones for yourself is a better structure than twelve identical mid-range glasses. Buy for the two situations separately.
A realistic inventory for two adults
- Six everyday tumblers of about 350 millilitres.
- Two tall glasses for iced coffee or long soft drinks.
- Two lidded jar glasses with handles for desks and the garden.
- One jug or carafe, only if you regularly pour for more than yourself.
- Four spare of something cheap and stackable for visitors, stored out of the way.
The replacement question
Glasses break, and a discontinued pattern means the set slowly stops matching. Buying a common, long-running shape is worth more than buying a fashionable one in quantity. If matching matters to you, buy two spares of that shape rather than doubling the whole order.
Storage costs are real
A shelf full of rarely used glassware is a shelf you cannot use for anything else, and in a rented kitchen that is often the binding constraint. Glasses stored at the back get dusty, need rinsing before use, and therefore never get used. Anything you have not touched in a year should go to a charity shop rather than continue to occupy prime space.
The honest summary
Buy fewer, buy better, buy in pairs, and let the collection grow towards what you actually drink. A cupboard with eight well-chosen pieces works better than one with twenty-four mediocre ones. The money saved on the set you did not need covers a jug and a decent set of straws with change left over.