У пакеті послуг десять гігабайтів.

У means in or inside here. It introduces the location or context: у пакеті послуг = in the service package / in the plan.

In Ukrainian, у and в are often interchangeable in meaning. The choice is usually made for smoother pronunciation, not because the meaning changes. So you may also see:

В пакеті послуг десять гігабайтів.

That would mean the same thing.

Because after у/в when you mean location, Ukrainian normally uses the locative case.

The base form is пакет.
After у, it becomes у пакеті = in the package.

So:

• пакет = package
• у пакеті = in the package

This is a very common pattern in Ukrainian:

• у місті = in the city
• у будинку = in the building
• у пакеті = in the package

Послуг is the genitive plural of послуга = service.

The phrase пакет послуг literally means a package of services. Ukrainian often uses this noun + noun in the genitive structure where English might prefer something like service package.

So:

• послуга = service
• послуг = of services

That means:

• пакет послуг = package of services
• у пакеті послуг = in the package of services

This is very natural Ukrainian.

Because Ukrainian commonly thinks of this as a bundle containing multiple services or features, so the plural is natural: пакет послуг.

Even if English uses a singular noun as an adjective, Ukrainian often does not. Instead, it prefers:

• пакет послуг = package of services
• not usually a direct equivalent of English service package

So this is not a strange grammar point; it is just a normal Ukrainian way of expressing the idea.

In the present tense, Ukrainian often omits the verb “to be”.

So the sentence literally looks like:

In the service package ten gigabytes.

But the meaning is understood as:

There are ten gigabytes in the service package
or
The plan includes ten gigabytes.

This is completely normal in Ukrainian.

If needed, Ukrainian can use є for there is/there are, for example:

У пакеті послуг є десять гігабайтів.

That is also correct, but the version without є is very natural.

Because after numerals 5 and higher, Ukrainian usually uses the genitive plural of the counted noun.

So:

• один гігабайт = one gigabyte
• два / три / чотири гігабайти = two / three / four gigabytes
• п’ять гігабайтів
• десять гігабайтів

That is why гігабайтів appears here.

This is one of the most important number patterns in Ukrainian.

The dictionary form is гігабайт.

Here are the forms you are most likely to notice:

• гігабайт = gigabyte
• гігабайти = gigabytes after 2, 3, 4 in many basic counting contexts
• гігабайтів = of gigabytes / gigabytes after 5+

So in this sentence:

• десять гігабайтів = ten gigabytes

No, Ukrainian word order is fairly flexible.

У пакеті послуг десять гігабайтів is natural because it starts with the context: in the plan. Then it gives the important information: ten gigabytes.

You could also say:

• Десять гігабайтів у пакеті послуг.
• У пакеті послуг є десять гігабайтів.

These versions are also understandable, but the emphasis shifts a little.

The original sentence sounds like a neutral statement of what the package contains.

No. Пакет can mean a physical packet or bag in some contexts, but here пакет послуг means a service package, plan, or bundle of services.

This is common in mobile phone, internet, TV, and subscription contexts.

So У пакеті послуг десять гігабайтів would normally be understood as something like a telecom or internet plan, not a literal box or bag.

Yes. Some common alternatives are:

• У пакеті послуг є десять гігабайтів.
• Пакет послуг включає десять гігабайтів.
• У тарифі є десять гігабайтів.

All of these are natural, but they are slightly different in style:

• є makes the existence more explicit
• включає sounds a bit more formal, like product description language
• у тарифі is especially common when talking about a mobile or internet plan

The original sentence is short, natural, and idiomatic.