How to Clean a Military Gore-Tex Bivy Sack

Written by kimberley riccio
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A Gore-Tex bivy, or bivouac, sack is a lightweight weather protection sack for sleeping bags. The sack provides an external layer of protection for an outdoor sleeping system. According to the Gore-Tex Care Center, routine care and maintenance extends the lifespan of the sack.

Skill level:
Moderately Easy

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Things you need

  • Washer
  • Liquid washing powder
  • Prewash treatment (optional)
  • Dryer
  • Towel
  • Iron
  • Durable water-repellent spray

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  1. 1

    Turn the washing machine on to a normal warm water cycle. Add 1/4 cup of liquid washing powder as the machine fills with warm water. Put the sack in the warm water wash. Don't add fabric softener or bleach in the wash. Use a prewash treatment product to remove any stains from the sack prior to inserting it in to the wash.

  2. 2

    Put the sack in the dryer. Turn the dryer on to a normal cycle. Don't add a fabric softener to the dryer. The dryer heat reactivates the water repellent on the sack.

  3. 3

    Put a towel between the sack and an iron to steam out the wrinkles. Ironing also reactivates the water repellent.

  4. 4

    Restore the water repellent if water fails to bead on the sack's surface. Spray the damp sack with a durable water-repellent spray. Put the sack in the dryer to activate the water repellent.

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