Packing for Mars is a hilarious (and informative) look at space travel. Roach focuses each chapter on a particular space curiosity; in addition to the previously mentioned bathroom-problem, Roach tackles the issues of motion sickness (specifically how NASA deals with vomit in space suits), the possibility of zero-gravity sex, coexisting with others in tight spaces, lack of personal hygiene, and the difficulty of creating non-disgusting space food (dehydrated astronaut ice cream is delicious, but what about a dehydrated beef sandwich?), among others.
Roach asks NASA for all the answers we (and our inner fifth-grader) want to know and presents the facts in an entertaining, funny, easy to read, and educational book. Though the book reveals that astronaut-life is full of struggles and discomforts, it doesn’t make the subject any less interesting (it fact, I'd say it makes reading about space that much more exciting).