Lanterna frontală este în rucsac.

Because Romanian puts the definite article at the end of the noun.

• lanternă = a flashlight / a lamp
• lanterna = the flashlight / the lamp

So lanterna frontală means the headlamp.

In Romanian, adjectives usually come after the noun they describe.

So the normal order is:

• lanternă frontală = headlamp
• literally, something like flashlight frontal

Putting the adjective first is possible in some cases for style or emphasis, but it is not the neutral everyday order here.

Because Romanian adjectives must agree with the noun in gender and number.

Lanternă is feminine singular, so the adjective must also be feminine singular:

• dictionary form: frontal
• feminine singular: frontală

So lanterna frontală is correct.

Romanian usually does not use a separate word like English the before the noun. Instead, the definite article is attached to the noun itself.

So:

• the headlamp → lanterna frontală

The article is carried by lanterna, not by a separate word.

Yes. It is the normal everyday Romanian expression.

Literally it looks like frontal flashlight, but Romanian speakers use lanternă frontală as the standard name for the object.

Yes. Este is the full form of is, and e is the shorter everyday form.

Both are correct:

• Lanterna frontală este în rucsac.
• Lanterna frontală e în rucsac.

The version with este sounds a little more careful or formal.

În means in or inside.

It normally takes the accusative case. In this sentence, rucsac is after în, so it is functioning as an accusative form. For this noun, though, the accusative looks the same as the basic form, so you do not see a visible change.

This is a very common Romanian pattern. After prepositions, Romanian often uses the bare noun for ordinary places, containers, and locations where English would often use the.

So în rucsac is a very natural way to say in the backpack in context.

If you want to specify the backpack more clearly, you usually add something after it, for example:

• în rucsacul meu = in my backpack
• în rucsacul negru = in the black backpack

So in a simple sentence like this, în rucsac is the normal choice.

Yes. Romanian word order is more flexible than English word order.

The neutral version is:

• Lanterna frontală este în rucsac.

But you could also say:

• În rucsac este lanterna frontală.

That version emphasizes the location more. The core meaning stays the same, but the focus shifts.

The two main special vowels here are:

• ă in frontală: a short neutral vowel, somewhat like the a in sofa
• î in în: a sound with no exact English equivalent; it is a close central vowel

A rough guide to the whole sentence is:

lan-TER-na fron-TA-lə ES-te ən rook-SAK

That is only approximate, but it can help you get started. The real Romanian î is more centered than any normal English vowel.