How Long Does Food Last in Mylar Bags?

Wheat berries last 30+ years in mylar bags — the longest-storing grain. Hard red and hard white wheat both store equally well. Grind into flour as needed. One gallon bag holds about 7 pounds of wheat berries, providing roughly 10,500 calories.

White rice stored in mylar bags with oxygen absorbers lasts 25-30 years at room temperature. Use 300cc oxygen absorbers per gallon bag or 2000cc per 5-gallon bucket. Store in a cool, dark place below 70°F for maximum shelf life.

Dried corn kernels last 20-25 years in mylar bags with oxygen absorbers. Cornmeal lasts 10-15 years. Use 300cc per gallon. Dried corn can be ground into cornmeal as needed, so storing whole kernels gives maximum flexibility and longer shelf life.

Rolled oats and steel-cut oats last 20-25 years in mylar bags with oxygen absorbers. Use 300cc per gallon. Quick oats store slightly shorter (15-20 years) due to more processing. Oats are calorie-dense at ~1,600 calories per pound.

Dried pasta lasts 20-30 years in mylar bags with oxygen absorbers. Use 300cc per gallon. Egg-free pasta stores longest. Shapes like elbow macaroni pack more densely than spaghetti, requiring less airspace management.

All-purpose white flour lasts 10-15 years in mylar bags with 500cc oxygen absorbers per gallon plus a desiccant packet. Whole wheat flour only lasts 1-2 years due to oil content. Flour requires larger absorbers because fine particles trap more air.

Quinoa lasts 8-12 years in mylar bags with oxygen absorbers. Shorter than rice because quinoa contains natural oils (saponins). White quinoa stores longest. Rinse thoroughly before cooking to remove bitter saponin coating.

Brown rice only lasts 1-2 years in mylar bags — far shorter than white rice (25-30 years). The bran layer contains natural oils that go rancid even without oxygen. For long-term storage, choose white rice instead. Brown rice is best for 6-18 month rotation plans.

Freeze-dried fruit lasts 25-30 years in mylar bags with oxygen absorbers and desiccant. Use 300cc per gallon. Freeze-dried fruit is extremely moisture-sensitive and will rehydrate if exposed to humidity. Always include a desiccant packet.

Dried fruit (raisins, apricots, cranberries, dates) lasts 5-10 years in mylar bags with oxygen absorbers. Higher sugar and moisture content limits shelf life compared to freeze-dried fruit (25-30 years). Unsulfured varieties store slightly shorter but are healthier.

Nonfat powdered milk lasts 15-20 years in mylar bags with oxygen absorbers and desiccant. Whole milk powder only lasts 2-5 years due to fat content. Use 300cc absorbers per gallon. Desiccant is essential as powdered milk absorbs moisture rapidly.

Dried whole egg powder lasts 5-10 years in mylar bags with oxygen absorbers and desiccant. Egg white powder stores slightly longer at 7-12 years. Extremely moisture-sensitive — always include desiccant. One pound of egg powder equals about 40 whole eggs.

Peanut butter powder (PB2, PBfit) lasts 5-10 years in mylar bags with oxygen absorbers and desiccant. Regular peanut butter only lasts 6-12 months due to high oil content. Powdered peanut butter has 85% less fat, making it far better for long-term storage.

Nuts and seeds last only 1-3 years in mylar bags with oxygen absorbers due to high natural oil content (50-70% fat). Almonds store longest at 2-3 years. Walnuts and pecans are shortest at 1-2 years. For longer storage, freeze nuts in mylar bags for 3-5 years.

White granulated sugar lasts indefinitely in mylar bags — no oxygen absorbers needed. Sugar does not support bacterial growth. The main threat is moisture causing clumping. Use mylar simply as a moisture and pest barrier. Do NOT add oxygen absorbers as they cause sugar to harden.

Baking soda lasts indefinitely (30+ years) in mylar bags. Baking powder only lasts 1-2 years as the leavening agents lose potency. Store baking soda long-term and baking powder for rotation only. Add desiccant to prevent clumping.

Honey lasts indefinitely and never spoils — archaeologists have found edible 3,000-year-old honey. Store in mylar bags only as a secondary moisture barrier. Honey crystallizes naturally but remains safe. Warm gently to re-liquefy. Do not use oxygen absorbers.

Salt lasts indefinitely in mylar bags — no oxygen absorbers needed. Like sugar, salt does not spoil. The main concern is moisture causing clumping. Iodized salt may lose iodine potency after 5 years, but the salt itself remains safe and usable forever.

Unsweetened cocoa powder lasts 10-15 years in mylar bags with oxygen absorbers and desiccant. Dutch-processed cocoa stores slightly longer than natural cocoa. Hot chocolate mix only lasts 2-3 years due to added dairy and sugar. Include desiccant — cocoa is highly hygroscopic.

Powdered sugar lasts 10-15 years in mylar bags with desiccant (no O2 absorber needed). Brown sugar only lasts 2-3 years because molasses content causes hardening. For long-term storage, store white granulated sugar and molasses separately.

Whole coffee beans last 2-5 years in mylar bags with oxygen absorbers and a one-way degassing valve. Ground coffee lasts 1-2 years. Coffee is unique because freshly roasted beans release CO2 for 2-3 weeks — wait before sealing or use a valve bag.