I'm a big fan of 75% keyboards. The layout retains nearly everything from a full-size keyboard except the number pad (i.e. there are F-keys, numbers, arrows, Escape, Home/PgUp/PgDown, etc.), but compresses it all into a single rectangular block.

For me, it's the perfect balance of compactness and usability. Fits snugly in my backpack but allows me to use my preferred set of keybinds since all the relevant keys are there.

Here's a site with a rundown of most of the popular sizes: https://www.keyboardco.com/blog/index.php/2017/08/full-size-...