U torbi imam nekoliko sitnica za putovanje.

Because the preposition u changes the case of the noun.

Here, u means in, showing location, so torba goes into the locative case:

• torba = bag
• u torbi = in the bag

A useful rule:

• u + locative = location, in/at
• u + accusative = movement, into

Compare:

• U torbi imam nekoliko sitnica. = I have a few small items in the bag.
• Stavljam sitnice u torbu. = I am putting the items into the bag.

Torbi is locative singular of torba.

The basic form is:

• torba = bag

After u when talking about being in a place, Croatian uses the locative:

• u torbi = in the bag

So in this sentence:

• u = in
• torbi = bag, in the locative singular

Imam is the 1st person singular present tense of imati (to have).

The verb forms are:

• ja imam = I have
• ti imaš = you have
• on/ona/ono ima = he/she/it has

So imam matches the understood subject I.

Croatian often leaves out the subject pronoun because the verb ending already shows who the subject is. That is why you see:

• Imam nekoliko sitnica.

instead of:

• Ja imam nekoliko sitnica.

Both are correct, but ja is usually only added for emphasis.

Nekoliko means several or a few.

It is a quantity word, and an important thing to remember is that it is normally followed by the genitive plural of the noun.

So:

• nekoliko sitnica = a few small items / several little things

Other examples:

• nekoliko knjiga = several books
• nekoliko dana = several days
• nekoliko ljudi = several people

So if you learn one pattern, make it this:

• nekoliko + genitive plural

Because after nekoliko, the noun goes into the genitive plural.

The noun is:

• sitnica = a small item, trifle, little thing

Its forms include:

• nominative singular: sitnica
• genitive singular: sitnice
• nominative plural: sitnice
• genitive plural: sitnica

So after nekoliko, Croatian needs the genitive plural, which is:

• nekoliko sitnica

This can be confusing because sitnica here looks exactly like the singular dictionary form, but grammatically it is genitive plural in this sentence.

Sitnica literally suggests a small thing, little item, or trifle.

In this sentence, nekoliko sitnica za putovanje sounds natural as something like:

• a few small travel items
• a few odds and ends for traveling
• a few little things for the trip

It does not necessarily mean something unimportant in a negative sense. It often just refers to small objects or miscellaneous little things.

Related word:

• sitan = small, tiny, fine

So sitnica is built from the idea of something small.

Za usually takes the accusative case, and here putovanje is in the accusative singular.

However, putovanje is a neuter noun, and for many neuter nouns the nominative and accusative forms are the same. So:

• putovanje = travel / journey / traveling
• za putovanje = for travel / for the trip

That is why the form does not visibly change.

Structure:

• za = for
• putovanje = travel, journey, traveling

So sitnice za putovanje means items for travel or travel items.

Croatian often uses a noun where English might use a different structure.

Here, putovanje is a verbal noun meaning:

• travel
• traveling
• a journey / trip, depending on context

So:

• sitnice za putovanje

literally means something like:

• little things for traveling
• little things for travel

This is very natural in Croatian. English often does the same:

• travel items
• things for traveling

So this construction is not strange in Croatian at all.

Croatian word order is fairly flexible, and the beginning of the sentence often shows what the speaker wants to emphasize or set as the context.

• U torbi imam nekoliko sitnica za putovanje.

This puts focus first on where the items are: in the bag.

A more neutral order could be:

• Imam nekoliko sitnica za putovanje u torbi.

But that version can sound a bit less clear, because u torbi could feel more loosely attached at the end.

Starting with u torbi is very natural because it sets the scene first:

• In the bag, I have a few travel items.

So the word order is not random; it helps shape emphasis.

Yes, that is also possible.

• Imam u torbi nekoliko sitnica za putovanje.

This is grammatically fine and still means the same thing. The difference is mainly style and emphasis.

Very roughly:

• U torbi imam... = emphasizes the location first
• Imam u torbi... = starts with the verb, then adds the location
• Imam nekoliko sitnica za putovanje u torbi. = possible, but can sound a little less neat depending on context

Croatian allows this flexibility much more than English does.

Because Croatian does not have articles like English a, an, and the.

So a noun like torba can mean:

• a bag
• the bag

The exact meaning depends on context.

That is why:

• u torbi can mean in a bag or in the bag
• nekoliko sitnica = a few items / several items

Croatian speakers rely on context, word order, and the situation instead of articles.

Yes, but that is completely normal in Croatian.

The verb imam already tells you that the subject is I, so Croatian usually leaves out ja unless it is needed for emphasis or contrast.

So:

• Imam nekoliko sitnica za putovanje. = I have a few travel items.
• Ja imam nekoliko sitnica za putovanje. = I have a few travel items. (emphatic)

This is one of the big differences from English, where the subject usually has to be stated.

It only looks singular. In this sentence, it is actually genitive plural.

This happens because some Croatian noun forms are identical in different cases and numbers.

For sitnica:

• singular dictionary form: sitnica
• genitive plural: sitnica

So in:

• nekoliko sitnica

the word sitnica is grammatically plural in meaning, even though its form looks like the singular base form.

This is a very common thing to get used to in Croatian: the form you see is not always enough by itself; you also need to look at the grammar around it.