Love these! I have a bunch of random vintage Penguin pocket-sized books from used bookstores; since I find them based on format, I end up choosing books I’d never have thought of otherwise. Some favorites are Love in a Cold Climate by Nancy Mitford and The Third Wedding by Costas Tsaksis.

“Livres de poche” also seem to be super popular in French publishing, not sure why they don’t make that size more in the American industry!