I do a lot of research and find I must refer back to my notes and other reference materials. These are great and stand the test of time. Have been using them for years
Pages in binders very often pull out of the holes creating the need for those little circles or replacing a page - frequently - if you can find one. Sheet protectors are my answer for heavy use. Reference materials shop or repair manuals important compilations of frequently referenced files. Just don’t want to worry about it staying clean readable and in one piece! Long-lasting through multiple users. Good price. Quick delivery.