UCanPack Boxes do more than pack—they showcase your vision, safeguard your products, and streamline your workflow UCanPack’s All Black Mailer Boxes deliver fast, stylish, and secure packaging for any use. Qualities of All Black Colored Mailer Boxes: Box Sizes are advertised in internal dimensions. Available in ECT-32 B flute with 1/8" thickness. Tested with 200# Mullen Bursting Test for strength and durability. Strong, crush-resistant, Lightweight yet durable. No adhesives required for closure. Manufactured in the USA. Dispatched within 3 days. Shipped flat to save space and reduce costs. Common uses include shipping, storing goods, packaging gifts, showcasing items for retail, enhancing brand presentation, organizing literature kits, supporting event setups, and serving a wide variety of personal needs. UCanPack Boxes protect, present, and simplify every packaging task.