I carried rat traps for years in my BOB. One of the guys from that Dual survival show has a bunch of videos, got the idea from him. http://www.youtube.com/watch?v=ZNpiyq02ccQ&feature=related
Same here, I keep three of the smaller mouse traps in my truck's BOB with some string to secure it down. Been thinking of some larger rat traps for the BOB in the house.