Odebranie paczki z paczkomatu jest dziś ważne.

It is a verbal noun: a noun made from a verb.

• base verb: odebrać = to pick up, collect, receive
• verbal noun: odebranie = the act of picking up / collecting

In this sentence, odebranie paczki z paczkomatu is the whole subject of the sentence.

A good way to think about it is:

• odebrać = to pick up
• odebranie = picking up / the pickup

Because it is a noun, Polish can use it very naturally as the subject of a sentence.

Because after a verbal noun like odebranie, Polish usually puts the object in the genitive case.

Compare:

• verb: odebrać paczkę = to pick up a package
  
  • paczkę is accusative
• verbal noun: odebranie paczki = picking up a package
  
  • paczki is genitive

This is a very common pattern with nouns ending in -nie or -cie that come from verbs.

So:

• czytać książkę → czytanie książki
• zrobić obiad → zrobienie obiadu
• odebrać paczkę → odebranie paczki

Because the preposition z here means from, and in this meaning it requires the genitive case.

So:

• paczkomat = parcel locker
• genitive singular: paczkomatu
• z paczkomatu = from the parcel locker

Be careful: z can mean different things in different contexts.

• z paczkomatu = from the parcel locker
• z kolegą = with a friend

Those uses take different cases, so the meaning matters.

Because it agrees with odebranie, which is grammatically neuter singular.

The key noun in the subject is odebranie, and nouns in -nie are usually neuter. So the adjective has to match:

• masculine: ważny
• feminine: ważna
• neuter: ważne

That is why we get:

• Odebranie ... jest ważne

Even though the phrase includes paczki and paczkomatu, the main word is still odebranie.

Here jest is the normal, neutral choice.

The sentence structure is:

• Odebranie paczki z paczkomatu = subject
• jest = is
• dziś ważne = important today

In colloquial Polish, jest is sometimes omitted in certain short statements, but in a sentence like this, leaving it out would sound unnatural or very elliptical.

So this is best:

• Odebranie paczki z paczkomatu jest dziś ważne.

Not very natural:

• Odebranie paczki z paczkomatu dziś ważne.

A paczkomat is a self-service parcel locker where you can pick up or send packages.

It is extremely common in Poland. Many learners first meet this word because it is everywhere in everyday Polish.

So odebrać paczkę z paczkomatu is a very ordinary real-life phrase in Poland.

Yes, the word order can change. Polish word order is fairly flexible.

This version is neutral:

• Odebranie paczki z paczkomatu jest dziś ważne.

Other possible versions:

• Dziś odebranie paczki z paczkomatu jest ważne.
  This emphasizes today more strongly.

• Ważne jest dziś odebranie paczki z paczkomatu.
  This sounds a bit more formal or stylized.

Polish often moves words around for emphasis, rhythm, or style, not because the grammar changes.

This is an aspect question.

• odebranie comes from odebrać = perfective
• odbieranie comes from odbierać = imperfective

Very roughly:

• odebranie focuses on a completed act
• odbieranie focuses on the process, repetition, or ongoing action

In this sentence, odebranie is more natural because the idea is that there is a specific package and it is important that the pickup be completed today.

If you said odbieranie paczki, it would sound more like the act/process of picking up the package.

Not naturally.

Polish usually does not use the bare infinitive as the subject in this kind of sentence the way English can use to pick up the package.

More natural Polish options are:

• Odebranie paczki z paczkomatu jest dziś ważne.
• Ważne jest, żeby dziś odebrać paczkę z paczkomatu.

So if English uses an infinitive, Polish often prefers either:

1. a verbal noun like odebranie, or
2. a clause with żeby

They mean the same thing: today.

• dziś is a bit shorter and slightly more compact in style
• dzisiaj is also completely normal and common

So you could also say:

• Odebranie paczki z paczkomatu jest dzisiaj ważne.

That sounds fine too.

Yes, it is grammatical and natural, but it sounds a bit formal or written because of the verbal noun odebranie.

In everyday speech, many people might prefer something more direct, for example:

• Ważne jest, żeby dziś odebrać paczkę z paczkomatu.
• Trzeba dziś odebrać paczkę z paczkomatu.
• Musisz dziś odebrać paczkę z paczkomatu.
  if speaking to one person

So the original sentence is good Polish, but it is slightly more abstract in style than the most conversational version.