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The BSC PREFERRED MFL1183K is a kraft corrugated document mailer box engineered for secure, damage-resistant transit of flat documents, files, and similar materials. Constructed from 200/ECT-32-B kraft corrugated board, this mailer features protective side flaps and a front outside tuck closure that locks contents in place without requiring tape, glue, or staples. The tool-free assembly design lets technicians, warehouse staff, and shipping departments prep a mailer in seconds. Sold as a pack of 50 units, this box is suited for operations that process regular document shipments and need a reliable, no-prep-required solution.
This mailer is designed for shipping, storing, and protecting flat documents, certificates, blueprints, legal files, and similar rigid or semi-rigid materials. The self-locking tuck closure and side flaps provide full enclosure without adhesives, making it practical for high-volume shipping environments, office mailrooms, or supply and distribution operations where speed and consistency matter.
Designed as a standard corrugated document mailer suitable for flat document shipping applications where ECT-32-B board strength and self-locking closure are required. Equivalent to part number S-16921.
No tools or adhesives are required to assemble this mailer. Fold along pre-scored lines, engage the side flaps, and close the front tuck to secure contents. Store flat in a dry environment prior to use to maintain board integrity. Avoid stacking heavy loads on assembled mailers to preserve the ECT-32-B crush rating.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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