10-100pcs Windowless White Envelope Business Office A4 Paper Bill Invoice

A standard rectangular paper envelop designed to securely hold a full, unfolded A4 sheet of paper. 
 
Features a self-adhesive closure and a plain front panel without a transparent window.
 
The standard C4 size is 229 mm x 324 mm (approximately 9 x 12.8 inches), which is specifically designed to accommodate an A4 document (210 mm x 297 mm) without the need for folding.
 
The envelope utilizes a self-seal closure, where a pressure sensitive adhesive strip is on the flap. This eliminates the need for moisture (licking) or tape.
 
The lack of a transparent window ensures complete privacy and confidentiality for the contents. The blank front panel also provides ample space for easy printing, labeling, or hand-addressing.
 
Made from durable paper, providing reliable protection during transit.
 
This envelope is multi-purpose and widely used for sending business correspondence, reports, contracts, invoices, photos, brochures, and other important documents in offices, schools, and homes.
 
They offer a clean, professional look for business correspondence, reports, and contracts, as the recipient's address is manually applied or printed directly onto the envelope.
 
The hassle-free-self-seal adhesive makes them efficient for quick, high-volume mailings, and many are compatible with most inkjet and laser printers for address printing.