Partners Brand B859 Heat-Seal Bubble Mailers No 6 12 1/2 x 19 Kraft PK50

Purpose-built mailers

Partners Brand B859 Heat-Seal Bubble Mailers are sized at 12 1/2 inches by 19 inches and come in a pack of 50. They suit businesses that ship flat, lightweight items and need a self-sealing kraft envelope with internal cushioning. The heat-seal closure creates a tamper-evident seal without tape or staples.

Heat-seal constraint

The mailers require a heat-sealing machine or impulse sealer to close; they cannot be sealed by hand. This limits use to operations that already own or can justify the equipment. Without a sealer the envelopes remain open and the contents are unprotected.

Kraft construction daily use

The tan kraft exterior resists tearing and handles ink stamps or labels cleanly. The internal bubble layer adds a cushioning buffer for documents, media or small parts during transit. Flat storage before sealing keeps warehouse space tidy and the 50-count pack supports regular shipping volume.