Have you ever ordered from Amazon and when a package was delivered wondered “what is this”. It is especially embarrassing when your spouse brings in the package and asks “What is this”.
It has probably happened to most of us, especially if we have Prime… and if the item is $25 or less. I have some packages that have not been opened. 
Amazon has made it too easy!!
The cure is to wait 24 hours before ordering… call it 3 day shipping. If you still remember it the next day… you probably should order it… if not forget about it.
===
Amazon has been great about selection and returns. After falling a few times, I looked for No slip shoes. The first pair, I returned. The second I love. They are made for Restaurant workers etc… they do not slip even on wet floors… never thought I would order shoes Mail Order.