seiriken o nakusanai you ni, kaban ni irete okimasu.

I put the number ticket in my bag so that I won’t lose it.

Breakdown of seiriken o nakusanai you ni, kaban ni irete okimasu.

• を: direct object particle
• に: location particle
• 入いれる: to put
• 〜ない: negative form

Questions & Answers about seiriken o nakusanai you ni, kaban ni irete okimasu.

What does 整理券 mean here?

整理券 usually means a numbered ticket, claim ticket, or queue ticket, depending on context.

Common real-life uses:

• a ticket you take when waiting in line
• a numbered entry ticket
• a claim/check ticket for something

So in this sentence, it is some kind of important small ticket that the speaker does not want to lose.

Why is the particle を used after 整理券?

を marks the direct object of the verb なくす, which means to lose.

So:

• 整理券をなくす = to lose the ticket

Even though the sentence later says put it in the bag, the first important grammar chunk is:

• 整理券をなくさないように = so as not to lose the ticket

That is why を appears there.

Why is it なくさない and not なくならない?