The Poly Mailers Shipping Envelope Self Sealing Bags are a convenient and practical solution for shipping items. With a size of 12″ x 15.5″ and a white color, these polyethylene bags are perfect for various occasions such as birthdays. This pack of 100 envelopes is designed for easy sealing and offers a secure way to send packages. Made in China, these mailers are lightweight and compact, making them a versatile choice for any shipping needs.