Maximum Absorbency Garment

A Maximum Absorbency Garment (MAG) is an adult-sized diaper with extra absorption material that NASA astronauts wear during liftoff, landing, and extra-vehicular activity (EVA) to absorb urine and feces.[1][2][3][4] It is worn by both male and female astronauts.[2] Astronauts can urinate into the MAG, and usually wait to defecate when they return to the spacecraft.[5] However, the MAG is rarely used for this purpose, since the astronauts use the facilities of the station before EVA and also time the consumption of the in-suit water.[2] Nonetheless, the garment provides peace of mind for the astronauts.[2]

The MAG was developed because astronauts cannot remove their space suits during long operations, such as spacewalks that usually last for several hours.[6][7] Generally, three MAGs were given during space shuttle missions, one for launch, reentry, and an extra for spacewalking or for a second reentry attempt.[5][8] Astronauts drink about 2 L (2.1 US qt) of salty water before reentry since fewer fluids are retained in zero G.[9] Without the extra fluids, the astronauts might faint in Earth's gravity, further highlighting the potential necessity of the MAGs.[9] It is worn underneath the Liquid Cooling and Ventilation Garment (LCVG).[7]


During the Apollo era, astronauts used urine and fecal containment systems worn under spandex trunks.[10][5] The fecal containment device (FCD) was a bag attached directly to the body with an adhesive seal,[11] and the urine collection device (UCD) had a condom-like sheath attached to a tube and pouch.[8][10] Women joined the astronaut corps in 1978 and required devices with similar functions.[11] However, the early attempts to design feminized versions of the male devices were unsuccessful.[11] In the 1980s, NASA designed space diapers which were called Disposable Absorption Containment Trunks (DACTs).[5] These addressed the women's needs since it was comfortable, manageable, and resistant to leaks.[11] These diapers were first used in 1983, during the first Challenger mission.[5]

Disposable underwear, first introduced in the 1960s as baby's diapers then in 1980 for adult incontinence, appealed to NASA as a more practical option.[11] In 1988, the Maximum Absorbency Garment replaced the DACT for female astronauts.[12] NASA created the name Maximum Absorbency Garment to avoid using trade names.[11] Male astronauts then adapted the MAG as well.[11] In the 1990s, NASA ordered 3,200 of the diapers of the brand name Absorbencies, manufactured by a company that has folded.[8] In 2007, about a third of the supply remained.[8]


The MAGs are pulled up like shorts.[5] A powdery chemical absorbent called sodium polyacrylate is incorporated into the fabric of the garment.[5][8][13][9] Sodium polyacrylate can absorb around 300 times its weight in distilled water.[5][13] Assuming the astronaut urinates, the diaper would only need to be changed every eight to ten hours.[5] The MAG can hold a maximum of 2 L (2.1 US qt) of urine, blood, and/or feces.[1][14] The MAG absorbs the liquid and pulls it away from the skin.[5]

Media attention

These garments gained attention in February 2007, when astronaut Lisa Nowak drove 1,450 km (901 mi) to attack Air Force officer Colleen Shipman out of jealousy for her former lover.[5][8][15] It was stated in a police report that Nowak said she used the diapers to avoid pit stops during her journey.[15] However, Nowak denied these claims and testified that she did not wear these diapers during her trip.[15]

See also


  1. Michael Barratt; Sam L. Pool (2008). Principles of Clinical Medicine for Space Flight. Springer. p. 384. ISBN 978-0-387-98842-9. Retrieved 11 June 2011.
  2. Kenneth S. Thomas; Harold J. McMann (2006). US spacesuits. Birkhäuser. p. 29. ISBN 978-0-387-27919-0. Retrieved 11 June 2011.
  3. Kish, A.L.; Hummerick, M.; Roberts, M.S.; Garland, J.L.; Maxwell, S.; Mills, A.L. (2002). "Biostability and microbiological analysis of Shuttle crew refuse" (PDF). SAE Technical Paper #2002-01-2356. Society of Automotive Engineers, Inc. Retrieved 11 June 2011.CS1 maint: uses authors parameter (link)
  4. Mary Roach (August 1, 1998). "Two Men in a Tub". DISCOVER. Kalmbach Publishing Co. Retrieved June 11, 2011.
  5. Alexandra Gekas (February 19, 2007). "What's The Deal With The Diapers?". Newsweek. The Newsweek/Daily Beast Company LLC. Retrieved June 11, 2011.
  6. "Shuttle EMU End Items". Archived from the original on 3 June 2011. Retrieved 11 June 2011.
  7. "Factfile: Walking in space". BBC. 26 October 2007. Retrieved 11 June 2011.
  8. Roy Rivenburg (February 9, 2007). "NASA diapers become topic No. 1". Los Angeles Times. Retrieved June 11, 2011.
  9. Jeremy Manier (February 11, 2007). "In space, no one can hear you pee". Chicago Tribune. Retrieved June 11, 2011.
  10. Mary Roach (2 August 2010). Packing for Mars: The Curious Science of Life in the Void. W. W. Norton & Company. p. 181. ISBN 978-0-393-06847-4. Retrieved 11 June 2011.
  11. Martin J. Collins (15 March 2007). After Sputnik: 50 years of the Space Age. HarperCollins. p. 196. ISBN 978-0-06-089781-9. Retrieved 11 June 2011.
  12. Gregory Vogt (1 March 2010). Is There Life on Other Planets?: And Other Questions about Space. Lerner Publications. p. 8. ISBN 978-0-8225-9082-8. Retrieved 12 June 2011.
  13. Jan W. Gooch (23 August 2010). Biocompatible Polymeric Materials and Tourniquets for Wounds. Springer. p. 35. ISBN 978-1-4419-5583-8. Retrieved 11 June 2011.
  14. Jennings, R.; Baker, E. (2000). "Gynecological and reproductive issues for women in space: A review". Obstetrical & Gynecological Survey. 55 (2): 109–116. doi:10.1097/00006254-200002000-00025. PMID 10674254.
  15. Eric M. Strauss (February 17, 2011). "Did Astronaut Lisa Nowak, Love Triangle Attacker, Wear Diaper?". ABC News Internet Ventures. Retrieved June 11, 2011.
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