I like both. I'd like to think physical and digital books each have their pros and cons. I try to be pragmatic about the issue.

Thinking back about school I remember the heavy weight of the backpack. That can be more efficient, I thought back then. Same with vacation however I don't want to unlock my ereader for border patrol, as a matter of principle. Not sure if we are at that point already. The point is, each have also privacy implications.