"We believe the recent back up in rates is probably the last best opportunity to extend duration," wrote Gargi Pal Chaudhuri, chief investment and portfolio strategist, Americas, at BlackRock. Generally speaking, the value of a bond goes up as interest rates go down, with longer-dated bonds seeing the biggest gains. While bond funds have been seeing inflows this year, there are still plenty of investors with excess cash in short-term accounts. Different funds that offer that type of exposure include the iShares 3-7 Year Treasury Bond ETF (IEI) , the SPDR Portfolio Intermediate Term Treasury ETF (SPTI) and the Vanguard Intermediate-Term Treasury ETF (VGIT) . Investors shouldn't go overboard with adding duration, because the long-term bonds on the market carry extra risk, Akullian said.

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Persons: BlackRock's, Gargi Pal Chaudhuri, Kristy Akullian, It's, Akullian, Investors shouldn't Organizations: Treasury, Federal, Investment Company Institute, BlackRock, CNBC, Treasury Bond ETF, Research, Investors Locations: Americas, BlackRock, US10Y