Yes you can travel - based on AP and 485 receipt notice.
But its ideal to have your EAD card along becos 'IF' the IIO asks to see your EAD card(which I doubt he will), you should be able to produce it. Becos given the fact your H1 has expired - what is then your basis of employment here, which in turn is the basis for your GC?
Guys - Any other thoughts on this?