Έχω συνηθίσει να κρατάω το νεσεσέρ μου έτοιμο, γιατί ταξιδεύω συχνά για δουλειά.

They are related, but they do not mean exactly the same thing.

• έχω συνηθίσει να... = I have got used to... / I am used to...
• συνηθίζω να... = I usually... / I tend to...

So in this sentence, Έχω συνηθίσει να κρατάω... means the speaker has become accustomed to doing this. It describes a state of being used to it.

Compare:

• Έχω συνηθίσει να κρατάω το νεσεσέρ μου έτοιμο.
  = I’m used to keeping my toiletry bag ready.

• Συνηθίζω να κρατάω το νεσεσέρ μου έτοιμο.
  = I usually keep my toiletry bag ready.

The second one focuses more on a repeated habit. The first one focuses more on familiarity/adjustment.

Because Modern Greek normally uses να + finite verb where English often uses an infinitive like to keep.

So:

• να κρατάω = literally something like that I keep, but in natural English it becomes to keep

After expressions like έχω συνηθίσει, Greek uses να to introduce the action someone is used to doing.

This is very common in Greek because Modern Greek does not use the old infinitive the way English does.

So:

• Έχω συνηθίσει να κρατάω...
  = I’m used to keeping...

It can mean hold, but here it means keep.

So κρατάω το νεσεσέρ μου έτοιμο means:

• I keep my toiletry bag ready

It does not mean physically holding it in your hand. Greek κρατάω has a wider range of meanings, including:

• hold
• keep
• maintain
• retain

In this sentence, keep is the natural sense.

Yes. They are two forms of the same verb.

• κρατάω = very common in everyday speech
• κρατώ = also correct, often felt as slightly more formal, more compact, or stylistically different

So both of these are possible:

• να κρατάω το νεσεσέρ μου έτοιμο
• να κρατώ το νεσεσέρ μου έτοιμο

A learner will hear κρατάω very often in spoken Greek.

έτοιμο means ready, and it describes the state of το νεσεσέρ μου.

So:

• κρατάω το νεσεσέρ μου έτοιμο
  = I keep my toiletry bag ready

This is a structure where the adjective gives the result or state of the object.

A very similar pattern exists in English:

• I keep the bag ready
• I leave the door open
• I paint the wall white

In Greek:

• κρατάω την πόρτα ανοιχτή = I keep the door open
• άφησα το φαγητό ζεστό = I left the food warm

So έτοιμο is not random extra information. It completes the meaning of κρατάω here.

Because it agrees with το νεσεσέρ, which is neuter singular.

Agreement in Greek matters a lot. Adjectives usually match the noun in:

• gender
• number
• case

Here:

• το νεσεσέρ = neuter singular
• so the adjective is έτοιμο = neuter singular

If the noun were feminine, you would use έτοιμη:

• κρατάω την τσάντα μου έτοιμη
  = I keep my bag ready

If it were masculine:

• κρατάω τον σάκο μου έτοιμο

νεσεσέρ is a borrowed word, from French originally, and it means something like:

• toiletry bag
• wash bag
• cosmetics bag
• vanity case

The exact English word depends on context, but toiletry bag is a very natural translation here.

It is commonly used in Greek for a small bag or case containing personal-care items.

Because Greek possessive pronouns in this use are usually weak forms that come after the noun.

So:

• το νεσεσέρ μου = my toiletry bag
• literally: the toiletry bag of-me

This is the normal Greek pattern:

• το βιβλίο μου = my book
• η φίλη σου = your friend
• το σπίτι τους = their house

If you want emphasis, Greek can use δικός / δική / δικό:

• το δικό μου νεσεσέρ = my own toiletry bag / my toiletry bag

But in a neutral sentence, το νεσεσέρ μου is exactly what you expect.

It is in the accusative, because it is the direct object of κρατάω.

The tricky part is that with neuter singular nouns, the article το looks the same in both:

• nominative
• accusative

So the form does not change here, but the function does.

In this sentence:

• κρατάω = I keep
• το νεσεσέρ μου = the thing being kept

That makes it the direct object, so accusative.

Yes, γιατί can mean both:

• because
• why

The difference comes from context, punctuation, and intonation.

Here it clearly means because:

• ..., γιατί ταξιδεύω συχνά για δουλειά.
  = ..., because I travel often for work.

As a question, it would be:

• Γιατί ταξιδεύεις συχνά;
  = Why do you travel often?

You could also use επειδή for because in many contexts:

• ..., επειδή ταξιδεύω συχνά για δουλειά.

But γιατί is extremely common and natural in everyday Greek.

It is present tense, and here it expresses a habitual / repeated action:

• ταξιδεύω συχνά = I travel often

Greek present tense can describe:

• what is happening now
• what happens generally
• repeated habits

In this sentence, because of συχνά and the context, it clearly means a regular habit, not necessarily something happening at this exact moment.

Because για δουλειά is an idiomatic, general expression meaning:

• for work
• on business

It refers to work in a general sense, not to one specific job task.

So:

• ταξιδεύω για δουλειά = I travel for work / on business

If you add the article, the meaning becomes more specific or shifts a little:

• για τη δουλειά μου = for my job / because of my work
• για μια δουλειά = for a job / for an errand / for some task

So για δουλειά is the natural general phrase here.

Not completely. Greek word order is more flexible than English word order.

The version in the sentence is very natural and neutral:

• ταξιδεύω συχνά για δουλειά

But you could also hear:

• συχνά ταξιδεύω για δουλειά
• ταξιδεύω για δουλειά συχνά

These alternatives can shift emphasis a little, but the meaning stays basically the same.

The sentence as given sounds smooth and standard, especially in everyday speech.