Many Americans might not have felt major effects from Donald Trump’s sweeping tariffs – until now.

That’s because a major shipping loophole expired at one minute past midnight on Friday. The de minimis exemption, as it’s known, allowed shipments of goods worth under $800 to come into the US duty free, often more or less skipping time-consuming inspections and paperwork.

The loophole helped reshape the way countless Americans shop, allowing ultra-low-cost Chinese e-commerce sites like Shein, Temu and AliExpress to pour everything from yarn to patio furniture, clothes to photography equipment and more into US homes.

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At the heart of the issue: the sheer volume of packages. More than 80% of total US e-commerce shipments in 2022 were de minimis imports, the vast majority of which come from China, according to a congressional research report.