The Mail Budz Poly Mailers Shipping Bags are premium 10x13 envelopes designed for efficient and secure shipping. With a self-sealing peel-n-seal feature, these poly mailers offer ease of use and protection for your items. Made in the United States, this package includes 300 units, making them ideal for businesses and individuals needing to ship a large number of items. With a shipping time of same or next day, these poly mailers provide a reliable and convenient solution for all your shipping needs.