Here's The Best Way To Store A Box Of Cereal And Keep It Fresh - Tasting Table
Briefly

"Cereal grains contain pentosans and starch, which absorb a lot of water. If you leave your box of cereal unsealed, the grains will soak up moisture from the air and soften."
"One way to store cereal for short-term use is using a bag clip. Simply leave the cereal inside its original packaging, roll it up tight, and secure the opening with a sturdy clip."
"Transferring cereal to an airtight container locks out moisture for months, encourages pantry organization, and allows for better stock-taking of your supplies."
"Some recommend putting cereal in the freezer to elevate breakfast, but caution is advised for long-term storage as optimal quality is maintained in dry spaces."
Read at Tasting Table
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