Partners Brand RM7W Flat Mailers 17 x 21 White PK100

Partners Brand RM7W Flat Mailers 17 x 21

These flat mailers measure 17 by 21 inches and arrive in a pack of 100. They suit offices and fulfilment teams that ship flat documents, catalogues or lightweight goods. The white surface accepts labels and handwritten addresses cleanly. Each unit is a single-use paper envelope.

Behaviour under sustained load

When used continuously for high-volume mailing, the stack of 100 feeds smoothly through manual or automated packing stations. The rigid construction resists bending while being filled and sealed. No reinforcement or liner is included, so heavier contents may need extra protection. The pack quantity supports extended runs without frequent reordering.

What this replaces and when the jump is worth it

These mailers replace smaller envelopes when documents exceed standard letter dimensions. They also substitute for poly bags when a rigid, professional presentation is preferred. The jump is worth it for shippers who regularly send unfolded A3 or oversized sheets and want a consistent, flat package. Buyers needing padded cushioning or water resistance should consider other formats.