Verpak die vervangingsproduk nou ingeval die koerierdiens vroeg kom.

Because this is a command. In Afrikaans, commands usually begin with the verb, just like in English:

• Pack the replacement product now...
• Verpak die vervangingsproduk nou...

The subject jy is usually omitted because it is understood. So the sentence is effectively telling someone: (You) pack the replacement product now...

Verpak means pack, package, or wrap up for sending.

It is a bit more formal and specific than just pak, which can also mean pack in a broader sense. In this sentence, verpak fits well because the product is probably being prepared for delivery.

Afrikaans, like Dutch and German, very often forms compound nouns as a single word.

So:

• vervanging = replacement
• produk = product

Together:

• vervangingsproduk = replacement product

This is very normal in Afrikaans. English often writes these as two words, but Afrikaans usually joins them.

That -s- is a linking sound/letter that often appears in Afrikaans compounds. It helps connect the two parts more naturally.

So instead of:

• vervangingproduk

you get:

• vervangingsproduk

You do not always add -s- in compounds, but it is very common in words of this type, and learners usually just have to get used to the standard form.

Because die is the normal definite article in Afrikaans, meaning the.

Unlike English, Afrikaans does not change the article for gender, and unlike some other languages, it stays very simple:

• die man = the man
• die vrou = the woman
• die produk = the product
• die produkte = the products

So both nouns take die because both are definite: the replacement product and the courier service.

Nou means now. It adds the idea of immediacy or urgency:

• Verpak die vervangingsproduk nou = Pack the replacement product now

It tells the person not to wait.

Its position is fairly natural here, though Afrikaans word order can allow some variation depending on emphasis.

Yes, ingeval is written as one word here, and it means in case.

So:

• ingeval die koerierdiens vroeg kom
• in case the courier service arrives early

It introduces a clause that gives the reason for taking a precaution.

Because ingeval introduces a subordinate clause, and in Afrikaans subordinate clauses usually send the verb to the end.

Compare:

• Main clause: Die koerierdiens kom vroeg.
  = The courier service arrives early.

• Subordinate clause: ... ingeval die koerierdiens vroeg kom.
  = ... in case the courier service arrives early.

That final kom is a very important word-order pattern in Afrikaans.

Because this part is a subordinate clause after ingeval.

In a normal main clause, you would say:

• Die koerierdiens kom vroeg.

But after ingeval, the verb moves to the end:

• ... ingeval die koerierdiens vroeg kom.

So vroeg comes before the final verb.

Koerierdiens literally means courier service.

It can refer to:

• the delivery service itself
• the courier company
• the courier delivery that is expected

Like vervangingsproduk, it is also a compound noun:

• koerier = courier
• diens = service

Usually, ingeval is better here.

• ingeval = in case
• as = if

These are related, but not always identical.

In this sentence, the idea is precautionary: Pack it now as a precaution, because the courier service might arrive early. That is exactly what ingeval expresses.

Using as would sound more like a simple condition rather than a precaution.

It sounds natural, but slightly neat or practical/formal because of words like verpak and koerierdiens.

In more casual speech, someone might also say something like:

• Pak die vervangingsproduk nou in...

But the original sentence is perfectly good Afrikaans, especially in a business, delivery, or customer-service context.