How to Store Sugar and Salt Long-Term
Sugar and salt last practically forever, but one common mistake turns them into a solid brick. The right way to store them for decades.
Sugar and salt are the easiest foods to store long-term, and also the ones people most often ruin, because the standard advice for other staples is exactly wrong for these two.
Why they last almost forever
Bacteria, mould and yeast all need water to grow, and sugar and salt have essentially none. That's what makes them preservatives in the first place. Kept dry, they don't spoil, so their shelf life is measured in decades, not years.
The one rule: no oxygen absorber
This is the mistake that catches everyone. With rice, beans and flour you add an oxygen absorber. With sugar and salt you must not, because absorbers pull in ambient moisture and that moisture fuses the crystals into a rock-hard block.
Sugar and salt want dryness, not oxygen removal. Seal them dry and leave the absorber out. It's the one case where the usual long-term-storage step is the wrong move.
How to store them
Seal sugar and salt dry in a mylar bag or a food-grade bucket with a gamma lid, or an airtight jar for smaller amounts. Keep them somewhere dry and stable; humidity is the only real enemy. A 5-gallon bucket holds roughly 35 lb of either, per our how-much-fits guide.
What if it already turned to rock?
It's still perfectly usable, just inconvenient. Break the block up with a spoon or blitz it briefly, and store the loosened sugar or salt somewhere drier. The hardening is a texture problem caused by moisture, not a safety one.
The verdict
Store sugar and salt dry, sealed, and without an oxygen absorber, and they'll keep for decades. Keep humidity out, skip the absorber, and that's genuinely all there is to it.
Sugar and salt keep for decades because they hold no moisture for spoilage. Seal them dry in mylar, a bucket or a jar, keep them somewhere dry, and never add an oxygen absorber, which fuses them into a brick. If they do harden, just break them up; they're still fine.
Frequently asked questions
Do you use oxygen absorbers with sugar or salt?
No. Absorbers draw in moisture and fuse sugar and salt into a solid brick, and there is no spoilage oxygen to remove anyway. Store them airtight and dry instead; an absorber does more harm than good here.
How long do sugar and salt last?
Practically forever, because they contain no moisture for bacteria or mold to grow in. Kept dry and airtight, both keep indefinitely; the only enemy is moisture, which cakes them.
How should I store sugar for the long term?
In an airtight, moisture-proof container kept cool and dry, with no oxygen absorber. A mylar bag or sealed bucket works as long as it stays dry. If sugar hardens, it is still usable once broken up.
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