12 x 4 x 4" (25 Pack) White Corrugated Mailers

These 12 x 4 x 4 inch white corrugated mailers are built from ECT-32-B single wall B-flute corrugated board in a self-locking, one-piece construction that requires no tape, glue, or staples to close. When folded, the structure creates double-wall thickness along the front and sides, adding compression resistance without any secondary reinforcement materials.

The white exterior finish makes these mailers well suited for e-commerce fulfillment, direct-to-consumer subscription boxes, retail replenishment, and light industrial sample shipping. The slim cross-section is specifically proportioned for elongated items such as bottled goods, rolled materials, hardware components, and cosmetic sets.

Each mailer is manufactured from ECT-32-B corrugated board and sold in a bundle of 25, with each bundle weighing approximately 7.75 lbs — compact enough to stage at individual packing stations. The parcel-friendly format ships via parcel carrier.