Anything over 9.5″ gets too tiring to hold and needs propped on knees, tummy, bed, chair, desk etc and needs a cover with a feature to allow it to stand, or a cheap book holder for table (about €2 here).
The Nxpaper 11 & 14 covers are lighter than the one for the 10.3" Elipsa. There are many kinds of iPad covers. The school one I've seen makes the iPad heavier than Nxtpaper 14 in cover. Also the 11 & 14 have 10,000 mAH battery. (Actually 10.9" and 14.25")
Even the the 10.3" einks and 10.1" Android LCDs are too heavy to read in the hand for long, that's why some of the Lenovo models with big batteries have a built-in folding out foot.
An 8″ eink can be held as as long as you like, but even at 300 dpi it's far too small for many PDFs. Great for epub reflowable novels. The Kindle DXG (9.7″) is too heavy for prolonged hand reading and has small battery and only 150 dpi Pearl screen.
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