The Kindle Oasis is a premium e-reader that we called the best overall e-reader. The only thing that makes this model international is the packaging, as users must pick the language for the e-reader during setup no matter what edition they buy. The 9th-generation Oasis features 8GB of storage, a 7-inch display with 300 pixels-per-inch (PPI), physical page-turning buttons, and battery life of up to six weeks when reading for half an hour per day. It also has a waterproof design and even works with Audible books so you can listen to your favorite books. We loved its thin design, bright screen, tactile page-turning buttons, easy library access, and the Kindle store's massive selection of books. The only downside is that Amazon e-readers do not support the industry standard EPUB format, meaning you can't buy books from other online sellers.