La etikedo por resendo estas en la skatolo.

La is the definite article in Esperanto, meaning the.

• la etikedo = the label
• la skatolo = the box

Esperanto has only one definite article, la, and it does not change for gender, number, or case in normal use. In this sentence, both things are understood to be specific: a particular label and a particular box.

The subject is La etikedo por resendo.

That whole noun phrase means the return label or more literally the label for returning/sending back. It is the thing being described as being somewhere.

So the structure is:

• La etikedo por resendo = subject
• estas = is
• en la skatolo = location phrase, in the box

Estas is the present-tense form of esti, which means to be.

So:

• estas = is / are / am, depending on context

In this sentence, it links the subject to its location:

• La etikedo ... estas en la skatolo = The label ... is in the box

Esperanto uses esti very regularly, much like English to be.

Por means for, and resendo is a noun meaning return, sending back, or shipment back depending on context.

So literally:

• por = for
• resendo = return / sending back
• por resendo = for return or for sending back

In natural English, the whole phrase often becomes return label.

Because after por, Esperanto often uses a noun to express purpose.

• resendi = to send back
• resendo = a return / sending back

So etikedo por resendo is literally a label for return.

This is a very common Esperanto pattern:

• taso por kafo = cup for coffee
• sako por donacoj = bag for gifts
• etikedo por resendo = label for return

Using the noun after por is straightforward and natural.

Yes. Resenda etikedo is also possible and means return label.

The difference is mostly in structure:

• etikedo por resendo = label for returning
• resenda etikedo = return label

Both are understandable. The version with por resendo spells out the purpose more clearly, which is often helpful for learners.

Por shows purpose or intended use.

So:

• etikedo por resendo = label for return → a label used when returning something

If you used de, it would suggest something more like of return or belonging/type in a different way, which is less natural here.

In this sentence, the idea is not that the label belongs to the return, but that it is used for the return. That is why por fits better.

En means in or inside.

So:

• en la skatolo = in the box

That is the normal preposition when something is located inside something else.

Compare:

• sur la skatolo = on the box
• apud la skatolo = next to the box
• sub la skatolo = under the box

Here, since the label is inside the box, en is the right choice.

Because there is no direct object here, and en la skatolo expresses location, not motion.

In Esperanto, -n is often used for:

1. the direct object
2. direction toward somewhere

But in this sentence:

• La etikedo por resendo is the subject
• estas is a linking verb
• en la skatolo tells where something is located

So no accusative is needed.

A useful contrast:

• La etikedo estas en la skatolo. = The label is in the box.
  Location only, so no -n.

• Mi metas la etikedon en la skatolon. = I put the label into the box.
  Here there is motion into the box, so skatolon can take -n.

Yes, Esperanto word order is fairly flexible, though the basic order here is very normal.

Standard order:

• La etikedo por resendo estas en la skatolo.

You could also say:

• En la skatolo estas la etikedo por resendo.

That version emphasizes the location a bit more, something like In the box is the return label.

Even though Esperanto allows flexibility, the original sentence is the most neutral and natural for everyday use.

Etikedo means label, tag, or sticker-like label in a general sense.

In this sentence, because of por resendo, it clearly means a return label, likely the kind used for mailing or shipping something back.

So the word itself is general, but the context makes the meaning specific.

Usually, yes. Skatolo means box, carton, or sometimes a small container, depending on context.

In a sentence about a return label, la skatolo most naturally means the box that contains the item or packaging materials.

A simple approximate pronunciation is:

la e-ti-KE-do por re-SEN-do ES-tas en la ska-TO-lo

A few helpful points:

• e is like e in bet
• o is like o in for, but kept pure
• a is like a in father
• stress in Esperanto usually falls on the second-to-last syllable

So:

• etikedo → e-ti-KE-do
• resendo → re-SEN-do
• skatolo → ska-TO-lo

Here is a very literal breakdown:

• La = the
• etikedo = label
• por = for
• resendo = return / sending back
• estas = is
• en = in
• la = the
• skatolo = box

So literally:

The label for return is in the box.

That is why the natural English meaning is The return label is in the box.