L'etiqueta de devolució és al paquet.

Because in Catalan, the singular article la usually becomes l' before a word starting with a vowel or silent h.

So:

• la etiqueta → l'etiqueta
• la hora → l'hora
• la aigua → l'aigua

This is called elision. It works a lot like French l'.

De devolució literally means of return or for returning.

Catalan often uses the pattern noun + de + noun where English prefers a compound noun or an adjective.

So:

• etiqueta de devolució = return label
• literally: label of return

In this sentence, devolució means the return of an item to a seller, not just any kind of “giving back.”

The accent is important because és and es are different words.

• és = is (from the verb ser)
• es = a pronoun, often like oneself / each other / itself, depending on context

So in this sentence, és is the verb: is.

The accent also helps show the stressed vowel.

Because a + el contracts to al in Catalan.

So:

• a + el paquet → al paquet

This is very common. Another common contraction is:

• de + el → del

But note that this only happens with el, not with la:

• a la caixa = not contracted

The preposition a in Catalan is broader than any one English preposition. Depending on context, it can correspond to at, in, or on.

So al paquet can be translated according to the situation.

In this sentence, if the intended meaning is that the label is attached to the outside, English naturally says on the package.

If you wanted to make inside the package very explicit in Catalan, you could say something like:

• dins del paquet = inside the package

Yes, Catalan can often use both ser and estar in location sentences, depending on nuance and dialect.

For many learners, especially those who know Spanish, this is surprising. Catalan uses ser for location more freely than Spanish does.

So:

• L'etiqueta de devolució és al paquet is natural.
• L'etiqueta de devolució està al paquet can also be possible in many contexts.

Very roughly:

• és can present the location more neutrally
• està can put a bit more focus on the item’s position or state of being there

You do not always need to force a big difference, though; in everyday Catalan, both may be heard.

Yes, paquet is masculine.

You can tell because its dictionary form is el paquet, and in the sentence you see the contraction al paquet, which comes from a + el paquet.

A good habit in Catalan is to learn nouns together with their article:

• el paquet
• l'etiqueta
• la devolució

That makes gender much easier to remember.

The ending -ció is very common in Catalan and is usually pronounced like see-O.

So devolució is approximately:

• de-vo-lu-see-O

More accurately, the stress is on the last syllable:

• devoluCIÓ

This matches many other Catalan words ending in -ció, such as:

• informació
• situació
• direcció

Not especially. The sentence follows a very normal Catalan pattern:

• L'etiqueta de devolució = the subject
• és = the verb
• al paquet = the location

So it is basically:

• [subject] + [verb] + [place]

What may feel unusual to an English speaker is not the sentence order, but the noun phrase etiqueta de devolució, because English prefers return label instead of label of return.