If you’re referring to the viral banana-storage tip, the “one kitchen item” is usually plastic wrap (cling film)—specifically, wrapping the stem/crown of the banana bunch.
🍌 Why it may help
Bananas naturally release ethylene gas, a plant hormone that accelerates ripening. Covering the stem can reduce the amount of ethylene escaping from that area and may slow ripening somewhat.
A few important caveats:
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It won’t reliably make bananas last exactly 10 extra days. The effect varies with temperature, ripeness, and how the bananas are stored.
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Separating the bananas and wrapping the individual stems can sometimes help more than leaving the whole bunch together.
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Keep unripe bananas at room temperature; refrigeration can interfere with normal ripening and may darken the peel.
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Once bananas are ripe, refrigerating them can extend their usable life, even though the peel may turn brown.
So the headline has a kernel of truth, but “10 days longer” is an exaggerated guarantee rather than a rule.
