Ray Dalio and Jim Rickards each have a big chunk in Treasuries, 55% and 40% respectively, to go along with their 7.5% and 10% in physical gold.
Rickards recommends Treasury notes (which mature in 2-10 years), while Dalio uses longer maturity Treasuries (40% long term, 15% intermediate term). Rickards also said he has 30% in cash.
Beyond gold, both recommend owning real assets. Dalio has 7.5% in commodities, and Rickards likes fine art and natural resource plays like oil, water, and land.