Here're some other advantages of having a mail service
like SBI if you're going to cruise
outside the US for long periods.
You will need to have a US address for financial institutions (banks, many credit card companies, and investment companies). An SBI address will simplify your life with the IRS, Social Security
and Medicare. SBI will forward their all mail to you.
If you have a mail order prescription drug service
, they will likely not mail your prescriptions to a non-US address. Have them sent to SBI so they can forward them to you.
Also, FedEx and UPS will ship to your Personal Mail Box at SBI. They won't ship to a USPS mailbox.