Potvrda o predatom prtljagu je u ručnom prtljagu.

The sentence breaks down like this:

• Potvrda o predatom prtljagu = the subject
• je = is
• u ručnom prtljagu = a location phrase, in the carry-on luggage

So grammatically it is:

• [Subject] + [is] + [location]

More literally:

• Potvrda = receipt / confirmation
• o predatom prtljagu = about the checked baggage
• je = is
• u ručnom prtljagu = in the hand luggage / carry-on luggage

Serbian often avoids long noun stacks like English does.

In English, you can easily say:

• baggage receipt
• luggage tag
• passport control officer

Serbian usually prefers a noun plus a prepositional phrase or an adjective-like form. So instead of stacking nouns, it often says something like:

• potvrda o predatom prtljagu = receipt concerning checked baggage
• literally, receipt about handed-over luggage

This is a very normal Serbian pattern.

Potvrda usually means confirmation, certificate, or receipt, depending on context.

In this sentence, it most naturally means something like:

• receipt
• baggage check receipt
• confirmation slip

So although potvrda is a broad word, the airport context makes the meaning clear.

The preposition o usually means about or concerning.

So:

• potvrda o predatom prtljagu = a receipt/confirmation about the checked baggage

This is a standard way in Serbian to describe what a document refers to.

Also, o requires the locative case, which is why both words after it change form:

• predat → predatom
• prtljag → prtljagu

Predatom comes from the verb predati, which means to hand over, to submit, or in this context to check in.

The form predat is a kind of passive participle, meaning:

• handed over
• submitted
• checked in

Then it changes to predatom because it must match prtljagu in case, gender, and number.

So:

• predat prtljag = checked baggage
• o predatom prtljagu = about the checked baggage

Because the sentence talks about two different kinds of luggage:

• predati prtljag = checked baggage
• ručni prtljag = hand luggage / carry-on luggage

So the meaning is:

• the receipt for the checked baggage is in the carry-on luggage

Even though repeating prtljag may feel heavy in English, it is perfectly understandable in Serbian. In practical airport language, this repetition is not unusual.

In both places, prtljagu is in the locative singular.

1. o predatom prtljagu

   • o requires the locative
   • so prtljag becomes prtljagu

2. u ručnom prtljagu

   • u can take either accusative or locative
   • here it means location, in, so it takes the locative
   • therefore prtljag is again prtljagu

So both are locative, but for different reasons tied to the prepositions.

Because after u meaning in, Serbian uses the locative for location.

The base form is:

• ručni prtljag = carry-on luggage

But in the sentence it becomes:

• u ručnom prtljagu = in the carry-on luggage

The adjective ručni must agree with prtljag, so it also changes to the locative form:

• ručni → ručnom

Je is the 3rd person singular present of biti = to be.

So it simply means:

• is

The sentence is an ordinary present-tense equational/location sentence:

• Potvrda ... je u ručnom prtljagu.
• The receipt ... is in the carry-on luggage.

Yes. Serbian word order is more flexible than English word order.

This version is neutral:

• Potvrda o predatom prtljagu je u ručnom prtljagu.

But you could also see:

• U ručnom prtljagu je potvrda o predatom prtljagu.
• Potvrda je u ručnom prtljagu.

Different word orders can shift emphasis:

• starting with U ručnom prtljagu emphasizes the location
• starting with Potvrda emphasizes the item

Still, the original order is completely normal.

No. They are opposite categories in airport language.

• predati prtljag = checked baggage, luggage you hand over at check-in
• ručni prtljag = hand luggage, carry-on luggage you take with you

So the sentence is specifically saying that the document related to the checked baggage is inside the carry-on luggage.

Yes, it is grammatical and understandable.

A native speaker might sometimes prefer a slightly smoother version in real life, depending on context, for example:

• Potvrda o predatom prtljagu nalazi se u ručnom prtljagu.
• Potvrda za predati prtljag je u ručnom prtljagu.

But the original sentence is still perfectly acceptable, especially in informational or formal contexts.

Yes. This is a very important Serbian pattern.

With u:

• locative = location, in
• accusative = movement into, into

Compare:

• Potvrda je u ručnom prtljagu. = The receipt is in the carry-on luggage.

  • location → locative

• Stavio sam potvrdu u ručni prtljag. = I put the receipt into the carry-on luggage.

  • movement/direction → accusative

So in your sentence, u ručnom prtljagu is locative because the receipt is already there.

Because potvrda is the subject of the sentence, so it stays in the nominative singular.

Its dictionary form is already:

• potvrda

So here:

• Potvrda o predatom prtljagu = the subject
• nominative is the correct case for the subject

Only the words after the prepositions o and u change case.

Yes, that is a very close literal translation.

Word-for-word:

• o = about / concerning
• predatom = handed over
• prtljagu = luggage

So literally:

• receipt about the handed-over luggage

But in natural English, that would usually become:

• receipt for the checked baggage
• baggage check receipt

This is a good example of how literal translation helps you understand the grammar, even if it is not the most natural final English wording.