#9 Envelopes - 3 7/8 x 8 7/8

Buyers can choose from regular, square-flap, and window styles in this size. Paper weights range from 20 lb to 32 lb across #9 business and reply-mail styles. Paper finishes include metallic. Representative colors include white, natural, and red. This #9 assortment supports reply mail, billing, statements, and other recurring office communication with practical window and paper choices.

Efficient business mailing relies on window options that keep the right address or form information visible. Peel & seal styles help streamline recurring #9 reply-mail and billing workflows. Window placement, paper stock, and closure style can be selected around reply-mail workflows and recurring billing tasks.

#9 envelopes are a common choice for reply mail and return correspondence, while also handling invoices, statements, payments, notices, checks, and forms. Business reply envelopes support accounting teams, schools, nonprofits, healthcare offices, administrative departments, and businesses that send recurring mail. Consistent #9 specifications help billing and reply-mail programs stay uniform from one mailing cycle to the next.