Transportable!  We go to a cabin annually and the bed there is soooo hard!  Tossing and turning, I wake up with aches and pains- not very restful for a vacation.  This topper made it softer and bearable.  The bed still wasn't as soft as I'd like, but a world of a difference.  I even got it back in the box it shipped in after a week of use to take back home with us.