Wherever I live, I usually have my TBR pile with me, my favourites and books that I have enjoyed. When I came to Uni, I had about 50 books which I brought with me. That's now increased to 150+!
I wouldn't feel right without having my Noughts and Crosses series in my room. The only series that I do leave at home, is my Harry Potter's!
When I go on holiday, I usually take two books to be sure but I rarely do any reading on holiday so I never end up reading them.