The Vanguard Total International Bond ETF (BNDX) has experienced $10.1 billion in flows YTD and offers investors exposure to investment-grade bonds that are denominated in foreign currency and hedged against fluctuations in currency using non-deliverable forward contracts. BNDX carries an expense ratio of 0.08%. The iShares TIPS Bond ETF (TIP) garnered $11.4 billion in flows YTD and offers investors exposure to U.S. government bonds with adjustable principal, depending on inflation measurements.