A Millbank bag is a portable water filtration device made of tightly woven canvas for outdoor use.[1] They are light, compact, and easy but slow to use.[2] The bag is filled with water, which filters through the canvas by gravity. It is useful for removing sediment and organic matter but the water may require further sterilisation before being drunk.[3]

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References

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  1. ^ Beer, Amy-Jane; Roy Halpin (2008). Moveable Feasts: What to Eat and How to Cook It in the Great Outdoors. Milnthorpe: Cicerone Press. pp. 79–80. ISBN 978-1-85284-534-6.
  2. ^ Edholm, Otto Gustaf; Alfred Louis Bacharach (1965). Exploration medicine: being a practical guide for those going on expeditions. Royal Geographical Society (Great Britain). pp. 6–7.
  3. ^ Warrell, D. A.; Sarah Anderson (2003). Expedition medicine. Royal Geographical Society (with The Institute of British Geographers). pp. 106–107. ISBN 978-1-57958-334-7.