200 #4 - 9.5x14.5 (Poly) Bubble Mailers Padded Envelopes By ValueMailers Our poly bubble mailers are lightweight padded mailers made from a durable, moisture resistant, multi-layer blend of polyethylene film. Durable and moisture-resistant, with exceptional puncture resistance, tear strength, and cushioning performance. The self-seal closure provides a reliable, tamper-evident seal to secure all enclosures. The opaque, bright white exterior film creates a crisp, professional image for your company.