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Conquer Big Mailings with the Rich Quality of C4 Envelopes from Quapri You will find that your business or personal mail can be more stylish and efficient. Our high-quality C4 envelopes for businesses cater to mailing documents up to A4 size without folding. It’s a great choice for official and personal use where quality is paramount. At Quapri, our C4 envelope packaging guarantees your mail to pop out in quality.