I traveled while on TX, using cold packs in a soft waterproof carry bag works very well, you can check in as well.
Pegasys is
ok as long as it is not exposed above 77 degrees for longer than 36 hrs. Some pharmacists say 48 hrs.
Best to keep you injections on schedule if possible, but a 1 time change will not hurt.
I never missed a dose of either. I was late a few times taking Riba, but that happens.