gomi no syurui ni ouzite, siteibukuro wo erabimasu.

に応じて is a grammar pattern meaning according to, depending on, or in response to.

In this sentence, ごみの種類に応じて means according to the type of garbage.

A useful way to remember it is:

• X に応じて Y = Y changes depending on X

So here:

• X = ごみの種類 (the type of garbage)
• Y = 指定袋を選びます (choose the designated bag)

This expression is fairly formal and is often used in rules, instructions, and official notices.

The particle の links two nouns together.

Here:

• ごみ = garbage
• 種類 = type / kind

So ごみの種類 means the type of garbage or garbage type.

You can think of の here as showing a relationship like:

• possession
• category
• description

In English, we often use of or just put one noun before another. In Japanese, の is the normal way to connect them.

Other similar examples:

• 本の名前 = the name of the book
• 日本の文化 = Japanese culture / the culture of Japan

Because 応じて usually appears in the pattern X に 応じて.

So the に is required by this expression. It marks the thing that something is based on or depends on.

In other words:

• 種類に応じて = depending on the type

This is not a general に meaning to or at. It is part of the fixed grammar pattern 〜に応じて.

応じて is the て-form of the verb 応じる.

• dictionary form: 応じる
• て-form: 応じて

応じる has meanings like:

• to respond to
• to comply with
• to be appropriate to
• to correspond to

In this sentence, it has the sense of corresponding to or depending on.

Because it is in the て-form, it connects this part of the sentence to the main action:

• ごみの種類に応じて、指定袋を選びます。

So the first part sets the condition or basis, and the second part gives the action.

指定袋 means designated bag or officially specified bag.

It is made of:

• 指定 = designation / specification
• 袋 = bag

In many Japanese cities, garbage must be put into special bags approved by the local government. So 指定袋 is not just any bag—it is the correct official bag for that kind of trash.

This is a very common word in contexts like:

• garbage collection rules
• city notices
• recycling instructions

The particle を marks the direct object of the verb.

Here, the verb is 選びます (choose), and the thing being chosen is 指定袋.

So:

• 指定袋を選びます = choose the designated bag

That is why を is used.

Japanese sentences usually place the main verb at the end.

So even though English says something like:

• Choose the designated bag according to the type of garbage

Japanese naturally puts the action last:

• ごみの種類に応じて、指定袋を選びます。

This is normal Japanese word order:

• background / condition first
• main action last

A very rough structure is:

• [depending on the garbage type], [designated bag] [choose]

選びます is the polite ます-form of 選ぶ.

• 選ぶ = plain form
• 選びます = polite form

Public instructions, notices, and official writing often use polite forms, even when they are not speaking directly to one person in conversation.

So 選びます sounds appropriate for:

• a guide
• a manual
• a city notice
• a rule explanation

If it were written more casually or in a dictionary-style label, you might see 選ぶ instead.

Yes, the subject is omitted, which is very common in Japanese.

The sentence does not explicitly say you, people, or residents, but the context makes it clear. In something like a garbage-sorting guide, the understood subject is usually:

• you
• residents
• people disposing of the trash

Japanese often leaves out information that is obvious from context.

So the sentence does not need to say:

• あなたは
• 住民は
• 人々は

unless there is a special reason to emphasize it.

Sometimes the meanings are similar, but they are not always interchangeable.

• に応じて emphasizes according to / depending on
• によって often means by, due to, or depending on, but it can sound more neutral or broader in function

In this sentence, に応じて is a very natural choice because the idea is:

• the correct bag changes according to the kind of garbage

So ごみの種類に応じて sounds very appropriate for a rule or instruction.

Using によって might be possible in some contexts, but に応じて more clearly highlights matching the bag to the category.

The comma helps separate the introductory condition from the main action.

So the sentence is organized like this:

• ごみの種類に応じて、 = according to the type of garbage,
• 指定袋を選びます。 = choose the designated bag.

The comma is not absolutely required in every sentence, but it is very common in instructional or formal writing because it makes the sentence easier to read.