einweg
disposable
Describes products or packaging that are intended to be used only once and then thrown away.
Um Müll zu vermeiden, sollten wir auf Einweg-Flaschen verzichten.
To avoid waste, we should do without disposable bottles.

disposable
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disposable
Describes products or packaging that are intended to be used only once and then thrown away.
Um Müll zu vermeiden, sollten wir auf Einweg-Flaschen verzichten.
To avoid waste, we should do without disposable bottles.

The word is made up of 'ein' (one) and 'Weg' (way). So it describes things that are intended for only one path: the one from use to trash.
Im Supermarkt gibt es leider fast nur noch Einweg-Verpackungen.
Unfortunately, there is almost only disposable packaging left in the supermarket.
'Einweg' (disposable) is used almost exclusively as an attribute before a noun, e.g. 'die Einweg-Tüte' (the disposable bag), or as part of a compound, e.g. 'das Einweggeschirr' (disposable tableware). Predicative use such as 'Die Flasche ist einweg' (The bottle is disposable) is very unusual.
Für die Party haben wir Einweg-Becher gekauft.
For the party, we bought disposable cups.
The word is often combined with products that are thrown away after a single use. Typical examples are 'Einwegflasche' (disposable bottle), 'Einweggeschirr' (disposable tableware), 'Einwegrasierer' (disposable razor), or 'Einweg-Maske' (disposable mask).
Bitte benutzen Sie für Ihre Getränke die bereitgestellten Einwegbecher.
Please use the provided disposable cups for your drinks.
one-time / unique
'einmalig' and 'einweg' both have to do with 'only once', but they are used differently. 'einmalig' means that something takes place, applies, or occurs only one single time. It can refer, for example, to a payment, an opportunity, or a promotion. 'einweg' describes products or packaging that you use only once and then throw away. The words can be confused because of the shared idea of 'once'. For appointments, promotions, or payments, 'einmalig' fits; for cups, bottles, or packaging, 'einweg' fits.

Bei der Wanderung nehmen wir keine Einwegflaschen mit.
We are not taking any disposable bottles with us on the hike.
Für den Kurs zahlen die Teilnehmer eine einmalige Gebühr.
The participants pay a one-time fee for the course.