Known cases / Meat & Fish / costcotuna
Did Kirkland tuna (Costco) shrink?
7 → 6.5 oz −7.1%Size Facts
Before7 oz
After
6.5 oz
Hidden unit-price rise at same price+7.7%
When2009
CountryUnited States
Evidenceconsumer-advocate report (photo of old/new packages)
Confidencehigh
Source: Mouse Print* — Some Tuna Cans Just Got Upsized! (mouseprint.org). Source fetched 2026-10-14. Check the math in the calculator.
What the source says
“Over the past decade or two, tuna cans have gone from 7 ounces to 6.5 ounces to 6.25 ounces to 6.125 ounces to 6 ounces and finally to 5 ounces last year”
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