It all depends on what you want to do with it. In my "work" backpack, I sometimes take my laptop, and most of the time I add my iPad and Kobo - iPad for quick internet access (much faster than waking up the laptop and looking for wifi), and Kobo for a few minutes of reading in the bus. A 10 inch eink reader would not be a problem in this setting, and would double as PDF reader, so to me it would be quite portable.
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