Series I savings bonds have been around for a quarter-century now, but they largely flew under investors' radar until recently. That's largely because for the past 25 years, consumers have generally seen an incredibly benign environment, with minimal pressures on prices.

When inflation spiked, however, everyone suddenly took a look at the jaw-dropping rates that I Bonds paid. With these bonds' interest rates approaching 10% for a brief six-month period, plenty of investors put their money into these inflation-adjusted savings bonds.

As price pressures ease, though, rates on I Bonds have come down. That's less appealing for those seeking a quick windfall, but the latest new I Bonds have a bonus that will pay buyers more for years to come.

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Source Fool.com