Blank Number 9 Envelopes (Pack of 100) - 3-7/8 x 8-7/8 Inch Small Return Envelopes - Blank Windowless White Envelopes FORMAL STYLE: Perfect for formal correspondence, these number 9 envelopes have a pure white color. They come with traditional V-shaped flaps and dual diagonal seams. Its classic style and finish make it perfect for regular business use. HIGHLY AFFORDABLE: Often used as everyday envelopes in offices and business locations, these no 9 envelopes are highly affordable and supremely versatile. From sending mass invoices to using them as return envelopes, these are one of the most utilized office supplies. Their affordable pricing allows you to buy in bulk. COMPACT SIZE: Number 9 envelopes have a compact dimension. Even though they are smaller in size they can be used to mail folded A4 documents. They are also popularly used as small return envelopes as they fit neatly inside number 10 envelopes. TRADITIONAL GUMMED SEAL: The flaps of each no 9 envelope comes with moisture activated gum. This allows for a quick and reliable seal.