You can easily hold 7-inch readers with one hand. That's becaue a 7-inch e-reader is slightly larger than an average smartphone. As a resulty, they're compact and you can easily take them with you on the go. This is also useful size if you read in the train or on holiday a lot. There are also water-resistant e-readers. With these, you can safely read a book at the pool without the risk of breaking your e-reader with water damage.