Named for its original use in high-stakes ledger and accounting work, bank paper is designed for and long-term information preservation. It is particularly "useful" for fountain pen enthusiasts due to its performance:

It resists feathering and bleed-through, even with wetter inks or broader nibs.

"Bank paper" is sometimes used as pull paper (glued inside cover boards) to counter the tension of leather as it dries, preventing the cover from warping.