200 Poly Bubble Mailers, 2 8.5" X 12" Poly Bubble Mailers Padded Envelopes, 200 Ct Usable space 8.5 x 11 High Quality Poly Bubble Mailers 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.