Tā gěi le wǒ yī zhāng bāopiào, bǎozhèng huòwù ànshí dàodá.
He gave me a guarantee that the goods would arrive on time.
Tips
usage
包票 most commonly appears in the phrase 打包票 (dǎ bāopiào), meaning 'to vouch for something' or 'to give a guarantee.' Saying 打包票 is a strong, informal guarantee.