Also, Amazon Prime is not available everywhere, for example it is not available to Hawaii. Edit: I have had 3 Amazon packages arrive in one day - one by USPS,

Also, Amazon Prime is not available everywhere, for example it is not available to Hawaii. Edit: I have had 3 Amazon packages arrive in one day - one by USPS, one by FedEx and one by UPS. I get mine at work, so I'm not bothered, but I can imagine it is a convenience for people who have to answer their own door for packages to know that everything will arrive in one go.