Oryginalne opakowanie jest w kartonie.

Because it agrees with opakowanie, which is a neuter singular noun.

• oryginalny = masculine
• oryginalna = feminine
• oryginalne = neuter

So:

• oryginalny telefon = an original phone
• oryginalna część = an original part
• oryginalne opakowanie = original packaging / the original package

In Polish, adjectives must match the noun in gender, number, and case.

Opakowanie is neuter.

A useful clue is that many Polish neuter nouns end in -e or -o, and opakowanie ends in -e.

That is why the adjective is oryginalne, not oryginalny or oryginalna.

Opakowanie can mean:

• packaging
• package
• packing
• sometimes container or box/pack depending on context

In this sentence, it most naturally means the original packaging or the original package.

So it may refer not just to the item itself, but to the packaging it came in.

Jest means is.

In this sentence, it links the subject to a location:

• Oryginalne opakowanie = the original packaging
• jest = is
• w kartonie = in the carton / in the box

So the structure is very similar to English: X is in Y.

Polish sometimes omits forms of to be in certain informal or special contexts, but here jest is the normal and natural choice.

Because after w meaning in, Polish normally uses the locative case.

So:

• dictionary form: karton
• after w: w kartonie

This is a very common pattern:

• w domu = in the house
• w sklepie = in the shop
• w samochodzie = in the car
• w kartonie = in the carton

Be careful: w can also take the accusative when it means movement into something, but here the meaning is location, not motion.

It can mean different but related things depending on context:

• cardboard
• a carton
• a cardboard box

In w kartonie, the most natural meaning is in a carton / in a cardboard box.

If you wanted to say specifically in cardboard as a material, the context would usually make that clear. Here it sounds more like a physical container.

It is in the nominative case because it is the subject of the sentence.

You can think of it as the thing being talked about:

• Oryginalne opakowanie = the original packaging
• jest w kartonie = is in the carton

So:

• opakowanie = nominative singular
• oryginalne also matches that nominative singular neuter form

Yes. Polish word order is more flexible than English.

This sentence can be rearranged, for example:

• Oryginalne opakowanie jest w kartonie.
• W kartonie jest oryginalne opakowanie.

Both are grammatical, but the emphasis changes.

• Oryginalne opakowanie jest w kartonie focuses first on the original packaging
• W kartonie jest oryginalne opakowanie focuses first on what is in the carton

The original version is neutral and straightforward.

Yes, it can be.

Polish does not have articles like a and the, so definiteness is understood from context.

So oryginalne opakowanie could mean:

• the original packaging
• original packaging

In many real situations, especially if people already know which item is being discussed, English would naturally translate it as the original packaging.

A rough pronunciation guide is:

o-ri-gi-NAL-ne o-pa-ko-VA-nye yest f kar-TO-nye

A few helpful points:

• rz is not present here, so that helps
• w is pronounced like English v, but before a voiceless consonant it often sounds more like f, so w kartonie sounds close to f kartonie
• nie at the end of opakowanie sounds roughly like nye
• stress in Polish usually falls on the second-to-last syllable:
  • orygiNALne
  • opakoWAnie
  • kartoNIE

Yes, but the meaning changes slightly.

• karton = carton / cardboard box
• pudełko = box, usually a more general box

So:

• jest w kartonie = it is in a carton / cardboard box
• jest w pudełku = it is in a box

If the original sentence specifically mentions a carton, kartonie is the better choice. If you just mean a box in general, pudełku could work.

Yes, very common.

It is often used in contexts like:

• online sales
• electronics
• collectibles
• product descriptions

For example, sellers often mention whether an item has the original packaging or is in the original packaging. So this phrase is very natural and useful in everyday Polish.