The biggest book I own is the Phaidon Atlas of Contemporary World Architecture, which weighs in somewhere between 17 and 18 pounds. It sits in a slot in my nightstand next to my bed, which has become it's permanent home by virtue of the fact that it's immensely unportable, even with it's large plastic carrying case. I read through it from time to time trying to pick which city I'd most like to visit on account of its recent architectural additions, but the book and I have not made any actual trips together for obvious reasons.

Perhaps the editors at Phaidon have been using their book to dream up travel itineraries as well because you can now buy a 'travel' edition of the book, which weighs in at 0.7 pounds and is about a third of the dimensions. With a list price of $20, versus the $160 of the original, they'll probably end up selling a lot of copies to people who already own the larger edition and who need a version to make up for the dimensionally challenged big brother.