Are there specific size requirements for shipping boxes?

I'm trying to send my earphones in for A/S (after-sales service), but I don't have any shipping boxes at home.
I'm thinking of just putting some bubble wrap inside a Lacto-Fit box and sending it that way; is that allowed under the size regulations? (The photo is from elsewhere)
I'm wondering if companies like CJ Logistics, Hanjin, or Lotte have specific size requirements, not just the Post Office.
‌