Books come in all different shapes and sizes. Some are lengthy and some are short. Coffee table books are hefty. Then there are tiny books.

Like the name implies, these are miniaturized books. They’re especially popular with young adults because the small size mimics holding a phone in your hand—except instead of scrolling, the youth can actually read an actual book (gasp!).

There’s an online book subscription service called Mouse Book Club that’s cashing in on this growing trend. They periodically release a series of tiny books—about a dozen or so in each set. Mostly classic, these feature complete short works, or a selection of a larger work.

Dutton Books for Young Readers, a division of Penguin Random House, came out with a series of tiny books is releasing some mini-versions of classic books.

These small scripts are already popular in the Netherlands, where they’re called Dwarsliggers. These feature thin pages, minuscule font, and books that can be read with only one hand.

Micro Library Books is a publisher that creates pocket-sized classics. The independent publisher out of England especially designs each book and then prints a limited run. A few dozen of these tiny books can fit in your hand (assuming they’re a normal size).

They’re cute and fun to look at, but they’re also practical. The only other way you’re going to fit that many books into your pocket is with an e-reader. Except these books don’t run out of battery.