For work I use a clairefontaine dotpad inside a lihit lab smart fit.
https://www.eng.lihit-lab.com/n-1647-note-book-cover/
I almost bought a lochby field journal... If the lihit gives up, may still buy one.
https://www.lochby.com/products/field-journal
In my man bag that I use outside of work I carry a rhodia #12 pocket notebook and a pocket pen (either a kaweco sport, the travellers brass, or a hongdian m2)