Padded Poly Bubble Mailers Envelopes Size #2 8.5"x11&rdquo; - Quantity 100 Innovation Weve applied a perforated line in the back of the envelopes so your customers can easily open their packages. Durability- Multi-layer, co-extruded film provides optimum moisture, puncture and tear resistance, especially for heavier items. Cushioning- 3 /16 inch thick Bubble Wrap material maintains thickness for excellent product protection throughout the shipping cycle. Cushioning- 3 /16 inch thick Bubble Wrap material maintains thickness for excellent product protection throughout the shipping cycle. Security- High-strength, hot-melt adhesive closure provides additional tamper resistance and assurance for mailing high value items.