The #9 white envelope is one of the most popular envelope styles globally. Often used for sending personal letters as well as business documents, these envelopes are both cost effective and durable. Businesses often use #9 envelopes to mail invoices, letters, statements, and receipts to their clients and customers. This particular #9 white tinted peel & seal envelope comes with more than few features. These envelopes come with security tint that completely prevents the viewing of the contents from outside. The envelope also comes with Peel & Seal closure system. More convenient than traditional gummed seals, this sealing method requires no moisture. These envelopes are also typically used as business return envelopes.