Overiview of I bonds, which are quite in vouge now with 10% interest. The deets:

• $10,000 max, per person, per year.
• Currently paying 10%
• Interest rate adjusts every six months
• It's a 30-year bond. You can withdraw funds any time, but there is a small penalty if you do it prior to 5 years.
• Risk-free
• You need to open an account at treasurydirect.gov