iMBAPrice&reg; 500 Self Seal 4x8 #000 White Poly Bubble Mailers Padded Envelopes + free USB Cable (Value Pack) Total 500 Envelops Pure White Poly Bubble Mailers (Inside & Outside) Our poly bubble mailers are unique, lightweight padded mailers made from a durable, moisture resistant, multi-layer blend of polyethylene film. The Patented tear opening system is the latest feature of our Mailer. This allows the mailer to be opened easily by the recipient but does not compromise the integrity of the mailer or the security of the contents. The film is laminated to a resilient, cushioning bubble material for added protection. The self-seal closure provides a reliable, tamper-evident seal to secure all enclosures. 500 Self Seal 4x8 #000 White Poly Bubble Mailers Padded Envelopes + free USB Cable