KC, just be forewarned that seat gel covers dont really work well. Sure they might for a toodle here and there, but they can bunch up and cause friction and pressure issues. A good pair of padded bike shorts work much better. Gel covers are really aimed at teh very casual rider who thinks that by touching them and feeling the cushion, that riding will be more comfortable.
If you havent used it before you go on this trip, be wary of it perhaps not really helping on long rides.