ملصق الإرجاع في الطرد.

In Modern Standard Arabic, the present tense of to be is usually not written.

So:

• ملصق الإرجاع في الطرد
• literally: the return label in the package
• natural English: The return label is in the package

This is a very common Arabic pattern called a nominal sentence.

It is one phrase: ملصق الإرجاع = return label / the return label.

This is an iḍāfa construction, often called a construct phrase. It links two nouns together, and the second noun specifies the first.

So here:

• ملصق = label / sticker
• الإرجاع = return

Together:

• ملصق الإرجاع = return label

Because in an iḍāfa construction, the first noun does not take ال.

So Arabic says:

• ملصق الإرجاع

not:

• الملصق الإرجاع

The definiteness of the whole phrase is controlled by the second noun. Since الإرجاع is definite, the whole phrase is understood as definite: the return label.

A useful rule:

• first noun in iḍāfa: no ال
• second noun: can be definite or indefinite
• the whole phrase gets its definiteness from the second noun

For the same reason: it is the first word of an iḍāfa construction.

The first noun in iḍāfa:

• does not take ال
• does not take tanwīn

So ملصق الإرجاع follows a normal grammar rule.

الإرجاع means returning or return.

It is a verbal noun related to the idea of sending back or returning something. In shipping or shopping contexts, ملصق الإرجاع is the normal kind of expression for return label.

So even though الإرجاع is literally something like the act of returning, in English we usually translate the whole phrase simply as return label.

في means in or inside.

الطرد means the package, the parcel, or the shipment, depending on context.

So:

• في الطرد = in the package

If the meaning were on the package, Arabic would usually use على instead:

• على الطرد = on the package

Because ط is a sun letter.

When ال comes before a sun letter, the ل sound is not pronounced, and the next consonant is doubled.

So:

• written: الطرد
• pronounced: aṭ-ṭard

This is a pronunciation rule only. The spelling still keeps ال.

With full vowel endings, it would be:

• مُلْصَقُ الإِرْجَاعِ فِي الطَّرْدِ

Why?

• ملصقُ is the subject of the nominal sentence, so it is nominative
• الإرجاعِ is the second part of the iḍāfa, so it is genitive
• الطردِ comes after في, so it is also genitive

In normal everyday writing, these endings are usually not written.

It can be understood as a full sentence:

• ملصق الإرجاع في الطرد = The return label is in the package

Grammatically, that works well as:

• ملصق الإرجاع = subject
• في الطرد = predicate

But in real-life contexts, Arabic also often uses short noun phrases in notices, labels, or instructions. So depending on where you see it, it could also feel like a brief informational phrase rather than a formal complete sentence.

A simple pronunciation guide is:

• mulṣaq al-irjāʿ fī aṭ-ṭard

If you include full case endings in careful MSA, it is closer to:

• mulṣaqu l-irjāʿi fī aṭ-ṭardi

For a beginner, the first version is usually enough.