Laranity on YouTube has some fantastic tips like this on the "things you probably don't know" videos that she occasionally does.

One that lots of people probably already knew but that I learned of within the past year or so is that if you're moving things from your inventory to a stack of that item in your bank (not material storage...if they go there, use the drop down menu to send them), that you don't have to find the item stack in your bank.

Just double click the stack in the inventory side of the bank dialog (not in your actual inventory window), and it'll automatically stack them on top of an existing stack of that item in your bank.