No.9 Reply Window Envelopes Reply envelopes also known as No.9 are used to receive a check back from your clients for payment of charges. Simply place your custom printed #9 envelope inside your regular envelope containing your invoice or monthly statement to facilitate your clients payments. Our reply envelopes window envelopes are printed on recycled 24# white paper durable paper meets or exceeds all content guidelines for EPA. Print it 4 Less is your online printing source for custom printed #9 window envelopes.
