Personally, I've not cracked a spine on a book in well over a decade as I prefer to do my reading digitally .It can be a little trickier in the direct sun, but hey, I put my hammock in the shade anyways.
Something that may just accompany me in the hammock is this tablet, the Teclast X89, which is a 7.5" dual booting Windows 10 and Android 4.4 reader.
Instead of the typical eReaders which use eInk, this has an IPS display and a modest spec list to be able to handle some relaxing use (it may not be your daily ... but for a lazy day, it'll be just fine).
At the $100CDN mark it's not all imposing on the wallet. Not bad. What do you think?