Millbank Bag

Basics

• An OSLT / Appropriate Materials type approach to Water Filtration
• Essentially a bag made of Tightly Woven Canvas (Typically something like Cotton that is cellulosic and porous) that filters MOST particles out of water
  • Probably not good enough compared to Microfiltration / Nanofiltration via Hollow Fiber Membrane based solutions like Lifestraw / Portable Water Filtration Pumps (such as those made by MSR etc)
• If combined with Boiling (Essentially 100c Based Pasteurization , Modified Procedures like Tyndallization , and Autoclaving can be more effective against more durable pathogens/products such as spores), it can make Potable Water from from a comparatively simple process
  • Main thing would be SOMEWHAT turbid and (potentially) pathogenic water->Less/Not Turbid Water that still may be pathogenic (via millbank bag)->(Mostly) Sterilized Potable Water via Boiling and/or Chemical Treatment and/or Further Filtration and/or something like a Steripen etc

COTS Options

Forest Fundamentals

• An Amazon Listing for the Product ( ‘’’~19 USD Each as of This Edit’’’ )
  • Has Printed Directions + a Max Fill Line on the Bag
  • Comes with a Stuff Sack
  • Mentions:
    • ” The Second Edition Millbank Bag: Now featuring taped seams and double overlock stitching, we've significantly enhanced its durability to reduce leakage. The waterproof carrying bags have been upgraded with reinforced stitching for added strength.”
    • ”thicker 12oz Unbleached Cotton Canvas ”
    • 550 Cord + A Carabiner + Grommet for Hanging
      • Mentions it being some sort of sUrViVaL cOrD that can be repurposed as a Fire Wick (Firestarter) , but if you are at the point you are burning your gear to get by…you have some issues, so this seems largely a gimmick
      • Uncertain if the grommet is Stainless, but not hard to swap out if need be

Helicon Tex

• An Amazon Listing for the Product ( ‘’’~16 USD as of this Edit’’’ )
• Less information, and potentially a plastic grommet, but otherwise largely the same thing
  • Instructions are printed on the stuff sack, not the millbank bag itself for better or for worse

Usual Flow Rate

• In terms of planning, per each bag how much water per minute/hour etc?