You should only have in the bank an emergency fund equivalent to about 6 months of expenses. Everything else please do yourself a favor and invest it. Remember the first rule of investing
DIVERSIFY, DIVERSIFY, DIVERSIFY
Yes invest in bonds but also other vehicles. Such as Real Estate, Mutual Funds, Stock, Tax Liens.
Me, I only put an amount covered by ta maximum insurance, in our country the max insurance is $10,000 so I will put equivalent to that.
I am not living a lavish lifestyle so I guess that can take care of my expenses too in case I will fail on investing.