Mia pasporto estas en la malgranda poŝo de la valizo.

In Esperanto, a possessive word like mia usually makes the noun definite by itself, so you normally do not add la.

• mia pasporto = my passport
• la pasporto = the passport

So la mia pasporto would usually sound unnecessary or unnatural in a basic sentence.

Because mia behaves like an adjective in Esperanto.

Esperanto adjectives end in -a, and possessive words such as mia, via, lia, ŝia, nia, ilia follow the same pattern:

• mia pasporto = my passport
• via valizo = your suitcase

Like adjectives, they can also change for plural or accusative when needed:

• mia pasporto
• miaj pasportoj
• mian pasporton

In this sentence, mia matches pasporto, which is singular and not accusative.

Because pasporto is not a direct object here. It is the subject of the sentence.

The structure is:

• Mia pasporto = subject
• estas = is
• en la malgranda poŝo de la valizo = in the small pocket of the suitcase

The accusative -n is mainly used for direct objects and for some motion expressions. Neither applies to pasporto here.

Because the sentence describes a location, not motion, and it has no direct object.

• estas en ... describes where something is
• en without -n usually means in/inside, as a location

So:

• en la malgranda poŝo = in the small pocket

If there were motion into something, Esperanto might use -n after the place expression:

• Mi metas la pasporton en la valizon. = I put the passport into the suitcase.

But in your sentence, the passport is already there, so no -n is needed.

Malgranda means small.

It is built from:

• granda = big, large
• mal- = the opposite of

So:

• granda = big
• malgranda = small

This is a very common Esperanto pattern. The prefix mal- often creates the opposite meaning:

• bona = good → malbona = bad
• varma = warm → malvarma = cold

Because the sentence refers to a specific pocket: the small pocket of the suitcase.

In Esperanto, la works much like the in English. Here it points to a particular pocket, not just any pocket.

So:

• poŝo = a pocket / pocket
• la poŝo = the pocket
• la malgranda poŝo = the small pocket

Here de la valizo means of the suitcase.

So:

• la malgranda poŝo de la valizo = the small pocket of the suitcase

The word de often shows a relationship like possession, belonging, or connection:

• la pordo de la domo = the door of the house
• la koloro de la aŭto = the color of the car

In other contexts, de can also mean from, but here it clearly means of.

Because the sentence is more specific.

• Mia pasporto estas en la valizo. = My passport is in the suitcase.
• Mia pasporto estas en la malgranda poŝo de la valizo. = My passport is in the small pocket of the suitcase.

The second sentence tells you exactly where inside the suitcase the passport is.

Estas means is, and en means in.

Together, they express location:

• estas en = is in

So:

• Mia pasporto estas en la malgranda poŝo de la valizo.
• My passport is in the small pocket of the suitcase.

This is a very common pattern in Esperanto:

• La libro estas sur la tablo. = The book is on the table.
• La kato estas sub la seĝo. = The cat is under the chair.

Yes. Esperanto word order is fairly flexible, especially in simple sentences like this one.

For example, you could also say:

• En la malgranda poŝo de la valizo estas mia pasporto.

That still means My passport is in the small pocket of the suitcase, but it emphasizes the location first.

The original version is the most neutral and straightforward for learners.

Poŝo is pronounced approximately like POH-sho.

A few useful points:

• ŝ sounds like English sh
• o is a clear vowel sound, like o in many European languages, not a reduced English schwa

So:

• poŝo ≈ POH-sho

Esperanto spelling is very regular, so once you know the letters, pronunciation is usually predictable.