you really need front zip.
Membrane suits are always going to be ****e due to there leak lack of insulation. Quite a few will disagree with that but as some one who has had to deal with a zip burst at 20 meters with 30 mins of deco to do I was in the pub not the hospital for 48 hours with a compressed neo.
Better than nothing though. Personally i would recomend the otter range.
Never flown with a dry bag on though so will defer to those that have.