Originally Posted by
Whirlybird
Leaving aside those who fly across the Atlantic, or just have to do Northern England to Southern Europe in one hop, do many others actually think about this that much?
Not often a problem; as already suggested, it's the last thing to do before a flight and the first thing after. Please hurry, Mr Customs!
For emergency use I always carry a couple of "convenience" bags

usable by both sexes. I tend to nip in the back and kneel down
During my first 14 hour leg in an Archer, wearing a drysuit, I made use of the trusty ziploc bag - inside the suit, it was a lot easier than taking it off!