https://www.ebay.com/itm/276403515343 <br /> archived copy

In 1984, Memindex was selling monthly planning calendars (pocket notebook size with spiral binding and a case) rather than their older small index card sized formats. Their calendar format looks eerily like what Day-Timer, a division of ACCO Brands, has been selling since at least the early 1990s.

This goes down to even the "cut here" triangles in the lower right corners of pages to help bookmark the current page.

4.92 x 3.07 inches

Collection in Focus: Sir Isaac Newton's Pocket Memorandum Book<br /> by The Morgan Library & Museum

https://www.youtube.com/watch?v=h0Zpo5yla7w

More details and a digitized version of this memorandum book at https://www.themorgan.org/collection/isaac-newton/memorandum-book

https://www.cygnoir.net/2024/01/20/how-i-pocket.html

https://web.archive.org/web/20180227134526/http://pileofindexcards.org/blog/2006/12/22/writing-format-of-fieldnote/

Hawk Sugano uses a wastebook-like process to take contemporaneous notes in a pocket notebook and later transfers the ideas to index cards for follow up and filing.

https://web.archive.org/web/20180227134635/http://pileofindexcards.org/blog/2007/01/27/pile-of-fieldnotes/

I certainly didn't see this coming as part of the Pile of Index Cards... pocketnotebooks! Ostensibly for quick note (idea) capture on the move with transfer later.

While mostly a digital guy, Tom Standage uses Moleskine's reporter's notebooks which he likes because they're the size of an iPhone 6 plus.

iPhone 6+ (6.22 in x3.06 in)<br /> Moleskine reporter's notebook (3.5 x 5.5 inches)

https://public-supply.com/

Notebook company. Orvis has used them for some of their leather folio refills in the past. (See https://www.orvis.com/leather-folio/26LS.html)

reply to u/peaberryxo at https://www.reddit.com/r/notebooks/comments/14to50w/how_do_you_use_pocket_sized_notebooks/

I generally carry one all the time and use it as a convenient "waste book". I quickly collect fleeting ideas or notes throughout the day so I don't forget the tidbits that are important. When I'm back at my desk or at the end of the day/week, I will transfer things into my calendar/planner, my primary to do list, copy out more fleshed out ideas or quotes into my commonplace book or add particular ideas and sources to my zettelkasten. It's really there for quick convenience and nothing more. If it's important it always goes somewhere else.