Fill in the blank (_) in the following sentence from the following choices.
Sentence: He packed his belongings in a suitcase instead of a box because the _ was sturdier.

Choice 1: He packed his belongings in a suitcase instead of a box because the suitcase was sturdier.
Choice 2: He packed his belongings in a suitcase instead of a box because the box was sturdier.
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
1
1.