I found the construction 筈はなくて and by helping me with the context, I suppose to have properly translated but I am not sure.

This backpack has been done in a special way, it is a magical bag that you can put many more items than what appears to be possible to put in it ... but it does not turn to my advantage!

If it is filled beyond its limits, things come out and break.

Of course, the important thing is that I am alive and well.

Yeah, is not an object of your dreams, it is not easy to handle!

Is it correct my interpretation of そんな都合のいいものの筈はなくて?

I think that the subject is denying the fact that the backpack is convenient.

  • 重さも健在 is a half-joking phrase which I don't know how to translate naturally, but it's "Its weight is also there" (ie, there's no way the content of the bag can be weightless, either.) And you may have gotten the last sentence wrong. Double-check whether it was 便利なアイテムはない or 便利なアイテムはない.
    – naruto
    Mar 11, 2016 at 2:17
  • Hello Naruto, the last sentence is 夢のような便利なアイテムはないんだよね。 this is my translation: Yeah , is not an object so dreamy and handy! I guess it does make sense if it is linked to the previous sentence 生地の限界がくれば溢れるし破れる。 If it is filled beyond its limits, things come out and break. As for 重さも健在 the sense could be "Of course the weight (the items contained in the backpack) must be safe and sound! Are you agree? Thanks, Nadia
    – Nadia
    Mar 11, 2016 at 2:28
  • Note that で changes the meaning of the sentence critically. 本ではない means "This is not a book" and 本はない means "There is no book."
    – naruto
    Mar 11, 2016 at 2:43
  • 1
    The subject of 破れる is the bag, not "things". 夢のような便利なアイテムはないんだよね。means 夢のような便利なアイテムなど存在しない, a perfect item of your dreams cannot ever exist.
    – chocolate
    Mar 11, 2016 at 9:34

1 Answer 1


The key here is the idea that the backpack is unusual, nearly magical, in how much it can contain despite its apparent small size. The finishing phrase:


筈{はず} in this context refers to the speaker's expectation. The なくて here is a conjugation of ない "not", so yes, this has a negative connotation. Much as in English advertisements, this full phrase could be translated as "there's no way this could be so good!"

Another more prosaic example of 筈 usage (usually written in kana) in a positive context might be あの手紙はもう届いたはずだ。 → "The expectation is that that letter has already been delivered." (literally) → "I'm pretty sure that letter has been delivered by now." (more idiomatically)

  • 1
    Thank you a lot! There is a negative connotation because the speaker couldn't t think that it could be so helpful! So it is to translate: "a thing like this so useful? Impossible to immagine! Right? Thanks, Nadia
    – Nadia
    Mar 11, 2016 at 1:41
  • @Nadia From what I've seen, 都合のいい often tends to be a pretty negative expression too - I've always read 都合のいい人 to be 勝手なことをする人, for example. It's obviously not quite the same context here, but I think it does add to the negativity even here.
    – cypher
    Mar 11, 2016 at 3:43

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