An addon that remembers the contents of your bank, bags, mail, equipped, currency, auction house, and display them anywhere in the world. Also able to remember/display the banks of any character on the same account on any server, as well as searching and exporting lists of bag/bank items out. It will also remember the contents of Guild Banks if you are able to view them.
Type /bi or /bankitems to see what is currently in your bank. You must visit your bank once to initialize. Type /bigb or /bankitemsgb to see what is currently in your guild bank. You must visit your guild bank once to initialize. Note that Guild Banks are a shared repository and changes can occur to it by other members of your guild.
https://www.curseforge.com/wow/addons/bank-items
https://www.wowinterface.com/downloads/info25399-BankItemsClassic.html#info