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The BSC PREFERRED M443 is a white corrugated mailer designed for shipping small, lightweight, and fragile items through standard mail and parcel carriers. Constructed from 200/ECT-32-B white corrugated material, the M443 delivers a strong yet lightweight enclosure that helps control postage costs. The fold-over design creates double walls of protection on the front and sides without requiring tape, glue, or staples, making it a fast and efficient option for pack-and-ship operations. Sold in packs of 50, these mailers suit warehouse staff, shipping departments, and fulfillment operations that need a reliable, ready-to-use mailer solution.
The M443 is suited for e-commerce fulfillment centers, distribution warehouses, print shops, and retail back-office shipping stations. It handles lightweight fragile goods such as photos, documents, small electronics, and flat merchandise where crush resistance is critical during transit. The self-folding design speeds up the packing process in high-volume environments. Each pack contains 50 mailers, making it practical for both low-volume and recurring bulk replenishment scenarios.
Designed as a direct equivalent to part number S-426. Suitable for standard parcel and mail shipping of small, lightweight fragile items across common carrier and postal services.
No tools are required to assemble or seal the M443 mailer. Fold along the scored lines to form the double-wall enclosure before placing the item inside. Ensure contents are fully contained before handing off to the carrier. Store flat in a dry environment to maintain board integrity prior to use.
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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