Thank You, all of these are such great ideas...I will definitely include her towel.  Each of them have a microfiber "doggie" towel, they are really thin & will be easy to pack.  As an aside, I do use our towels on them, but my Dad may not appreciate it LOL
 
I will also include a small supply of shampoo and a few toys....I am more stressed about thinking about things to pack for her than I am things for us. 
I do own a pop-up crate and will definitely include that also 
