Mailing envelopes and small packages my receive as many as 27 handlings during shipment with the maximum drop height of 1.2 m. The contents of the mailing envelopes often need protection from shock and vibration damage. Cushioning or padding can be built into the mailing envelope to help protect the contents.
A Life Cycle Analysis as been conducted to compare a Kraft paper mailer with newsprint padding to a LDPE plastic mailer with air bubble padding. Both had advantages and disadvantages; overall, the Kraft padded mailer had a higher overall environmental impact compared to the LDPE bubble mailer. The study recommended use of future products with lower mass and which use renewable resources.
- Singh, S P (2010). "Measurement and Analysis of 'Small' Packages in Next-day Air Shipments". Packaging Technology and Science. 23: 1–9. Retrieved 18 September 2018.
- US3867874A, ONeil, "Method for making padded envelope", published 1975
- US8468779B2, KannankerilIan M. Donegan, "Method and apparatus for positioning, inflating, and sealing a mailer comprising an inner inflatable liner", published 2013
- US3948436A, Banbara, "Multilayer bag", published 1974
- Pilfold, K (2013). A Comparative Life Cycle Assessment of Protective Mailers in the Postal Industry (PDF) (MSc). University pf Calgary.
- Soroka, W, "Fundamentals of Packaging Technology", IoPP, 2002, ISBN 1-930268-25-4
- Yam, K. L., "Encyclopedia of Packaging Technology", John Wiley & Sons, 2009, ISBN 978-0-470-08704-6