kono kurai nara, hitori de hakobemasu.

このくらい means about this much, about this size, or to this extent.

In this sentence, it most likely refers to the size, weight, or amount of something. So the speaker is basically saying:

• if it’s about this big
• if it’s only this much
• if it’s around this size

くらい is often used to show an approximate degree or amount.

Also, このくらい and このぐらい mean the same thing. ぐらい is just a voiced variant and is very common in speech.

Both このくらい and これくらい are natural, but they are built a little differently.

• このくらい = this amount/this degree
• これくらい = this much / about this

A simple way to think about it:

• この normally modifies a noun
• これ stands on its own as this

Since くらい can behave like a noun-like word meaning amount/degree, このくらい is possible.

In everyday Japanese, このくらい and これくらい are often very close in meaning, and either may sound natural depending on context and speaker preference.

なら sets up a condition or topic like:

• if it’s this much...
• if it’s about this size...
• in that case...

So このくらいなら means something like:

• if it’s only this much
• if it’s about this size
• as long as it’s this much

The nuance is that the speaker is judging the situation based on that condition. In other words:

• If it’s this size, then I can carry it alone.

This なら often sounds like the speaker is responding to what they see or to information already known.

Even though この usually comes before a clear noun, here the phrase このくらい works as a fixed expression meaning this much or about this size.

So you do not need to add a noun after it.

For example:

• この箱 = this box
• このくらい = about this much / this 정도

It may feel unusual at first if you are used to この + noun, but このくらい is a very common set phrase.

一人で means by oneself or alone.

Here, で marks the means, manner, or state in which the action is done. So:

• 一人で運べます = can carry it alone
• literally, can carry it with one person

This is a very common pattern:

• 一人で行く = go alone
• 一人で食べる = eat alone
• 一人でできる = can do it alone

So で is not marking a location here. It is showing how the action is performed.

Japanese often leaves out things that are obvious from context.

In このくらいなら、一人で運べます, the thing being carried is understood from the situation, so the object is omitted.

A fuller version might be:

• このくらいなら、これを一人で運べます。
• この荷物なら、一人で運べます。

But in natural Japanese, if everyone already knows what it is, leaving it out sounds more natural.

This is very common in Japanese conversation.

運べます is the polite potential form of 運ぶ.

• dictionary form: 運ぶ = to carry
• potential form: 運べる = can carry
• polite potential form: 運べます = can carry (polite)

So the sentence is not just saying carry; it is saying be able to carry.

This is formed from the godan verb 運ぶ like this:

• 運ぶ
• 運べる
• 運べます

Here it expresses ability.

So it means:

• I can carry it
• It is possible for me to carry it

It does not mean permission like may carry in this context.

The speaker is talking about whether they are physically capable of carrying it alone.

The subject is omitted, which is very normal in Japanese.

From context, it is most likely:

• I can carry it alone or
• one person can carry it alone

In many everyday situations, listeners naturally understand the subject without it being said.

If the speaker wanted to make it explicit, they could say:

• 私はこのくらいなら、一人で運べます。

But usually that is unnecessary.

The sentence has the nuance of a practical judgment:

• If it’s only about this much, I can carry it by myself.

It suggests that there is some limit involved. In other words:

• This amount is manageable
• This size is okay
• Anything bigger/heavier might be difficult

So the speaker is not just stating ability in a general way. They are saying that under this condition, carrying it alone is possible.

The comma is not absolutely required, but it is very natural.

It helps show a pause after the conditional phrase:

• このくらいなら、 = if it’s about this much, ...

The comma makes the sentence easier to read and reflects the natural rhythm of speech.

Without the comma, the sentence is still understandable:

• このくらいなら一人で運べます。

Both are fine. The version with the comma just feels a little clearer.