It's worth noting that the yield on these sorts of things are quite low. All of the eTIBs maturing before 2035 currently have negative yields, meaning that you'd actually be paying a small fee for the inflation protection. The US TIPS yields are also <0 until 2023.
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The US Treasury also offers a fairly similar product called TIPS--Treasury Inflation Protected Securities http://www.investopedia.com/terms/t/tips.asp
It's worth noting that the yield on these sorts of things are quite low. All of the eTIBs maturing before 2035 currently have negative yields, meaning that you'd actually be paying a small fee for the inflation protection. The US TIPS yields are also <0 until 2023.