Science-backed food preservation grounded in USDA, NCHFP, and University Extension research.
dehydrating • Crop: All Dehydrated Foods
8 min read • Updated: August 2026

Storing Dehydrated Foods: Mason Jars, Mylar, Oxygen Absorbers

Properly dried and conditioned food is only as good as its packaging. Discover how airtight glass jars and oxygen absorbers preserve flavor and nutrients for years.

Key Scientific Takeaways

  • • The four enemies of dried food are Moisture, Oxygen, Light, and Heat.
  • • Store dried food in airtight glass Mason jars with vacuum lids or Mylar bags.
  • • Oxygen absorbers remove O2 to prevent oxidation and insect development; they do not remove moisture.
  • • Store all dried goods in a cool (50°F–60°F / 10°C–15°C), dark pantry away from sunlight.
  • • Properly stored dried vegetables retain quality for 1 to 3 years; fruits for 1 to 2 years.

Required Supplies & Ingredients

Item Quantity / Specification Technical Notes
Glass Mason Jars with Metal Lids Pint and Quart sizes Impermeable to air and moisture.
Mason Jar Vacuum Sealer Attachment Regular and wide-mouth Removes air without heating the jar.
Food-Grade Oxygen Absorbers 100cc to 300cc packets Iron powder oxygen scavengers.

Step-by-Step Procedure

Interactive Kitchen Checklist
Step 1

Verify Completion of Conditioning

Never package food for long-term storage until it has successfully completed the 7 to 10 day conditioning test with zero condensation.

Critical Safety: Sealing unconditioned food with residual moisture in an airtight oxygen-free bag creates an environment where mold can grow.
Step 2

Option A: Vacuum-Sealed Glass Mason Jars (Best for Everyday Pantry)

Fill clean, dry Mason jars with conditioned food up to the rim. Place a flat canning lid on the jar. Use a jar vacuum sealer attachment to evacuate air until the lid is sealed down firmly.

Pro Tip: Glass allows you to inspect food quality instantly and is 100% rodent-proof and puncture-proof.
Step 3

Option B: Mylar Bags with Oxygen Absorbers (Long-Term Storage)

Place food inside a 5–7 mil thick Mylar bag. Drop in a properly sized oxygen absorber (e.g. 300cc for a 1-gallon bag). Heat-seal the top edge with an impulse sealer or flat hair iron.

Critical Safety: Keep unused oxygen absorbers sealed in an airtight glass jar; exposure to air exhausts their absorbing capacity within 30 minutes.
Step 4

Store in a Cool, Dark, Dry Location

Place sealed containers in a dark pantry, closet, or basement where temperatures stay between 50°F and 65°F. Shield clear glass jars from light in cardboard boxes or opaque cupboards.

Pro Tip: Every 18°F (10°C) drop in storage temperature doubles the retention of vitamins and flavor.

Oxygen Absorber Sizing Guide for Home Preservers

Container Size Dense Pack (Powders/Beans) Loose Pack (Vegetable Chips/Herbs)
1 Pint Mason Jar (500ml) 50cc absorber 100cc absorber
1 Quart Mason Jar (1 Liter) 100cc absorber 300cc absorber
1 Gallon Mylar Bag (4 Liters) 300cc absorber 500cc absorber

Frequently Asked Questions

Can I use an oxygen absorber with moist dried fruit? ▼

No. Food safety extensions advise against using oxygen absorbers with foods that contain more than 10% moisture (such as pliable dried fruit or raisins). Creating an anaerobic environment in the presence of free moisture can create botulism risk. Only use oxygen absorbers with fully crisp, brittle foods (under 10% moisture).

Scientific Citations & University Extension Bibliography

Every parameter, salinity threshold, temperature range, and step in this guide is derived directly from the following authoritative publications:

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