Ayer empaqué mi maleta para el viaje, pero aún necesito más ropa.

Because ayer tells you the action happened at a specific, finished time in the past. In Spanish, that usually calls for the preterite.

• Ayer empaqué mi maleta = a completed action yesterday
• If it were empacaba, it would suggest an ongoing, repeated, or background action in the past, which does not fit as well here

So empaqué is the natural choice for I packed as a finished event.

This comes from the verb empacar.

In the yo form of the preterite, verbs ending in -car change c to qu before é:

• buscar → busqué
• sacar → saqué
• empacar → empaqué

This spelling change keeps the hard k sound.

The accent mark on é is there because regular -ar verbs in the yo preterite end in -é.

So:

• empac-é would be pronounced with a soft c sound if written with just c
• Spanish changes it to empaqué to keep the correct pronunciation

Because the two clauses refer to different times:

• Ayer empaqué mi maleta... = what happened yesterday
• ...pero aún necesito más ropa. = what is true now

So the speaker is saying:

• Yesterday, I packed my suitcase
• But I still need more clothes now

This kind of time shift is completely normal in both Spanish and English.

Here aún means still.

So:

• aún necesito más ropa = I still need more clothes

Yes, todavía would also work:

• pero todavía necesito más ropa

In everyday Latin American Spanish, aún and todavía are often interchangeable when they mean still/yet.

A useful learner rule is:

• aún = still / yet
• aun = even

That rule is not the whole story in every grammar discussion, but it is very helpful and safe for learners.

Because ropa is usually an uncountable collective noun in Spanish, like clothing in English.

So Spanish normally says:

• más ropa = more clothes / more clothing

Even though English uses plural clothes, Spanish usually keeps ropa singular.

The plural ropas does exist, but it is much less common in ordinary conversation and often sounds more specific or stylistically marked.

Because the speaker wants to clearly identify it as my suitcase.

Both possession patterns exist in Spanish, but they are used differently:

• mi maleta = my suitcase
• la maleta = the suitcase

Spanish often uses the definite article instead of a possessive with things like body parts or when possession is very obvious from context. But with personal items like luggage, mi maleta is very natural and common.

So empaqué mi maleta is the most straightforward way to say it.

Because para expresses purpose or intended use.

• para el viaje = for the trip, for the purpose of the trip

That fits the idea: the suitcase was packed for the trip.

If you said por el viaje, it would more likely mean something like:

• because of the trip
• due to the trip

So in this sentence, para is the correct preposition.

Yes. Both are possible, but they are not exactly the same in feel.

• empaqué mi maleta = I packed my suitcase
• hice la maleta = I packed my suitcase / I got my suitcase ready

Hacer la maleta is a very common idiomatic expression in Spanish.
Empacar la maleta is also perfectly understandable and common, especially in Latin America.

So if you are learning Latin American Spanish, empaqué mi maleta sounds fine.

Because Spanish usually leaves subject pronouns out when the verb already makes the subject clear.

• empaqué already tells you the subject is I
• necesito also already tells you the subject is I

So Spanish normally says:

• Ayer empaqué mi maleta... not
• Ayer yo empaqué mi maleta...

You could add yo, but it would usually add emphasis or contrast:

• ...pero yo aún necesito más ropa
  = ...but I still need more clothes

Yes, it is standard and natural here.

Pero joins two clauses:

• Ayer empaqué mi maleta para el viaje
• aún necesito más ropa

In Spanish, a comma is commonly used before pero when it connects two full clauses, just as in English.

So this punctuation is normal:

• Ayer empaqué mi maleta para el viaje, pero aún necesito más ropa.

Yes. Maleta is widely understood across Latin America and is a very common word for suitcase.

Depending on the country, you may also hear other words, such as:

• valija in some places
• equipaje for luggage in general, not one specific suitcase

But maleta is a very safe, broadly useful word for learners.

Yes, but the meaning can shift slightly depending on where aún goes.

Compare:

• pero aún necesito más ropa = but I still need more clothes
• pero necesito aún más ropa = but I need even more clothes / still more clothes

In the original sentence, aún modifies the whole idea of needing and means still.
If you move it closer to más, it can start to sound more like even more.

So the original order is a very natural way to express I still need more clothes.