deungsanhwawa ubineun nae baenang ane isseo.

와 means and here.

In Korean, 와/과 are the basic written forms for and connecting nouns:

• 와 after a noun ending in a vowel
• 과 after a noun ending in a consonant

So:

• 등산화와 우비 = hiking boots and a raincoat

Since 등산화 ends in a vowel sound, 와 is used.

Here, 는 is the topic marker. It marks 등산화와 우비 as the topic of the sentence.

So the structure is roughly:

• 등산화와 우비는 = as for the hiking boots and raincoat
• 내 배낭 안에 있어 = they are inside my backpack

This is slightly different from an English subject marker. Korean often uses 은/는 to introduce what the sentence is about.

A version with 이/가 is also possible, but the nuance changes:

• 등산화와 우비는 내 배낭 안에 있어.
  = talking about those items as the topic
• 등산화와 우비가 내 배낭 안에 있어.
  = more neutral or more focused on the fact that those items are there

Because 등산화와 우비 works as one combined noun phrase: hiking boots and raincoat.

Then 는 is attached to that whole phrase:

• 등산화와 우비는

You do not need to mark each noun separately here. Korean often treats connected nouns as one unit.

내 is the common shortened form of 나의, which means my.

So:

• 나의 배낭 = my backpack
• 내 배낭 = my backpack

In everyday speech, 내 is much more natural and common.

안에 means inside or in the inside of.

It is made of:

• 안 = inside
• 에 = location particle, often meaning at/in/on

So:

• 배낭 안에 = inside the backpack

This is more specific than just 배낭에, which can sometimes simply mean in the backpack.
Using 안에 emphasizes that the items are physically inside it.

Because Korean normally puts location information before the verb, especially with 있다.

A very common pattern is:

• A는 B에 있어 = A is in/at B

So here:

• 등산화와 우비는 = topic
• 내 배낭 안에 = location
• 있어 = exist / are

Korean verbs usually come at the end of the sentence.

있어 is the casual/plain spoken form.

Here are the main versions:

• 있어 = casual
• 있어요 = polite
• 있다 = dictionary form / plain written style

So this sentence sounds like casual speech to someone you are close to:

• 등산화와 우비는 내 배낭 안에 있어.

A polite version would be:

• 등산화와 우비는 제 배낭 안에 있어요.
  or
• 등산화와 우비는 내 배낭 안에 있어요.

Because Korean verbs do not change for singular vs. plural.

English says:

• it is
• they are

But Korean uses the same verb form either way:

• 있어 = is / are, depending on context

So 등산화와 우비는 ... 있어 is completely normal.

Korean often leaves plurality unmarked when the meaning is already clear.

In this sentence, there are clearly two items because they are listed:

• 등산화와 우비 = hiking boots and raincoat

So adding 들 would usually be unnecessary.

Korean uses 들 only when the speaker wants to emphasize plurality or when it helps clarity. In many everyday sentences, no plural marker is needed.

Yes. Korean word order is somewhat flexible as long as the particles make the roles clear.

For example, you could also say:

• 내 배낭 안에 등산화와 우비는 있어.
• 내 배낭 안에는 등산화와 우비가 있어.

These versions are not identical in nuance, though.

For example:

• 등산화와 우비는 내 배낭 안에 있어.
  Focuses on the hiking boots and raincoat as the topic.
• 내 배낭 안에는 등산화와 우비가 있어.
  Focuses more on what is inside my backpack.

So yes, the order can change, but the emphasis changes too.

Korean often expresses possession and location with 있다, which basically means to exist / to be present.

In this sentence, 있어 means are located or are there:

• 내 배낭 안에 있어 = are inside my backpack

The same verb is also used in possession sentences:

• 나는 배낭이 있어. = I have a backpack.

So 있다 covers both ideas that English separates into be and have, depending on the structure.

It could be understood either way from the word alone, but in real usage 등산화 often refers to a pair of hiking boots/shoes as a category item.

Korean nouns usually do not force you to mark singular/plural the way English does. So:

• 등산화 can mean a hiking boot, hiking boots, or hiking footwear, depending on context

In this sentence, the intended meaning is naturally understood from the situation, so Korean does not need extra marking.

A natural polite version is:

• 등산화와 우비는 내 배낭 안에 있어요.

If you also want to make my more polite, you can say:

• 등산화와 우비는 제 배낭 안에 있어요.

Here:

• 내 = my
• 제 = my (humble/polite)

So 제 배낭 is better in polite conversation when referring to your own backpack.