Ho paura di strappare la borsa se la riempio troppo.

In Italian, paura is a noun, not an adjective in this expression. So Italian says avere paura = to have fear / to be afraid.

• Ho paura = I’m afraid
• not sono paura

This is one of those expressions you just learn as a set phrase.

After avere paura, Italian often uses di + infinitive when you are afraid of doing something or of something happening through your action.

So:

• Ho paura di strappare la borsa = I’m afraid of tearing the bag

This is very natural Italian. The pattern is:

• avere paura di + infinitive

For example:

• Ho paura di sbagliare = I’m afraid of making a mistake
• Ha paura di cadere = He/She is afraid of falling

Strappare means to tear, to rip, or to pull apart by force.

In this sentence, it means the bag might get torn because it is being overfilled.

So strappare la borsa means:

• to tear the bag
• to rip the bag

A native English speaker might expect something like the bag might tear, but Italian can express the idea from the speaker’s point of view: I might tear the bag if I fill it too much.

Italian uses the definite article much more often than English.

So where English often says:

• tear the bag
• fill the bag

Italian naturally says:

• strappare la borsa
• riempire la borsa

Even when English might drop an article in some contexts, Italian usually keeps it.

That la is a direct object pronoun meaning it. It refers back to la borsa.

So:

• la borsa = the bag
• la riempio = I fill it

Italian often avoids repeating the noun and uses a pronoun instead.

So the full logic is:

• se la riempio troppo = if I fill it too much

In Italian, object pronouns like lo, la, li, le usually come before the conjugated verb.

So:

• riempio la borsa = I fill the bag
• la riempio = I fill it

This word order is normal in Italian, even though English puts it after the verb.

The verb is riempire = to fill, and its first-person singular form is riempio.

This is the normal present tense pattern:

• io riempio = I fill
• tu riempi
• lui/lei riempie
• noi riempiamo
• voi riempite
• loro riempiono

The ie is just part of the verb’s conjugation. It is not irregular in a strange way; it is simply the standard form you need to learn.

Because in Italian, real or possible conditions often use se + present indicative, just like English can use if + present.

So:

• Se la riempio troppo, ... = If I fill it too much, ...

This is a normal conditional idea about a real possibility, not a hypothetical contrary-to-fact situation.

Compare:

• Se piove, resto a casa = If it rains, I stay home / I’ll stay home
• Se la riempio troppo, strappo la borsa = If I fill it too much, I tear / might tear the bag

Here troppo means too much or too full, depending on how you translate it naturally.

In the sentence:

• riempio troppo would sound incomplete by itself in some contexts
• la riempio troppo means I fill it too much / I overfill it

So troppo is modifying the action of filling. It tells you the amount is excessive.

Yes. A very natural alternative would be:

• Ho paura che la borsa si strappi se la riempio troppo.

This means:

• I’m afraid the bag will tear if I fill it too much.

This version focuses more on the bag tearing, while the original sentence focuses more on my action causing the tear.

So:

• Ho paura di strappare la borsa... = I’m afraid of tearing the bag...
• Ho paura che la borsa si strappi... = I’m afraid that the bag will tear...

Both are natural, but they frame the situation a little differently.

The word order can change.

You can also say:

• Se la riempio troppo, ho paura di strappare la borsa.

This means the same thing. Starting with the se clause simply puts more emphasis on the condition.

Both versions are natural:

• Ho paura di strappare la borsa se la riempio troppo.
• Se la riempio troppo, ho paura di strappare la borsa.

Sometimes, but strappare is more precise here.

• strappare = tear, rip
• rompere = break

A bag made of cloth, paper, or soft material is more likely to tear, so strappare fits better.
If you said rompere la borsa, it would sound more general, like damage or break the bag, but not specifically by ripping it.

So in this sentence, strappare is the better choice.