Why This Skill Matters in an Emergency or Survival Situation

In survival scenarios, preserving food for extended periods is crucial. Oxygen absorbers are a key component in this process, as they remove oxygen from sealed containers, significantly extending the shelf life of dry goods. By reducing the oxygen content to less than 0.01%, these absorbers inhibit the growth of aerobic bacteria and fungi, thus preserving the quality and safety of stored food.

What You Need

  • Dry food items (rice, beans, pasta, flour, etc.)
  • Oxygen absorbers (typically available in various sizes)
  • Mylar bags or food-grade plastic containers
  • Desiccants (optional)
  • Sealing tape or heat sealer
  • Scale or balance for measuring food weight
  • Calculator

Step-by-Step Instructions

  1. Weigh Your Food: Accurately measure the weight of the food you wish to store. This is crucial for determining the correct number of oxygen absorbers needed.
  2. Determine Oxygen Absorber Size: Oxygen absorbers are typically available in different sizes, such as 300cc, 1000cc, and 2000cc. The size you need depends on the volume of food and the type of container. A general rule is to use one 300cc absorber for every 1000cc (1 liter) of food.
  3. Prepare the Container: Ensure your Mylar bags or plastic containers are clean and dry. If using Mylar bags, consider adding a desiccant packet to further reduce moisture.
  4. Add Oxygen Absorbers: Place the appropriate number of oxygen absorbers into the container. It’s important to use the correct number to ensure all oxygen is absorbed without leaving any behind.
  5. Seal the Container: Carefully seal the container using a heat sealer or sealing tape. Ensure there are no air pockets or leaks.
  6. Label and Store: Clearly label the container with the contents and date. Store in a cool, dry place away from direct sunlight.

Common Mistakes and How to Avoid Them

  • Incorrect Oxygen Absorber Size: Always match the absorber size to the volume of food. Using too few can leave oxygen in the container, while using too many can lead to moisture issues.
  • Moisture Contamination: Ensure all containers are completely dry before sealing. Moisture can cause the oxygen absorbers to activate prematurely.
  • Improper Sealing: Double-check that all containers are sealed properly. Any leaks can compromise the effectiveness of the absorbers.

Variations, Tips, and Related Techniques

  • Use of Desiccants: While not always necessary, desiccants can further protect against moisture, which can degrade food quality over time.
  • Testing Absorbers: Before use, test oxygen absorbers by placing them in a sealed container with a small amount of food. If the absorber is effective, the bag will collapse as it removes oxygen.
  • Rotation of Stock: Even with proper preservation techniques, it’s wise to rotate your food stock to ensure freshness.

TLDR: Properly calculating and using oxygen absorbers extends the shelf life of dry goods, ensuring food safety and quality in survival situations.

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