On Thursday, December 21, 2017 at 11:50:16 AM UTC-6, wrote:
I use a quart sized zip lock baggie with a toddler size diaper folded inside of it (inside out, with the absorbent part exposed). This takes care of the danger of the bag getting punctured, since the diaper soaks up the liquid (in a couple of minutes). Yes it's a bit of a distraction when using it, but I can choose when to use it, during a quiet part of the flight (cruise rather than thermal).

And I never throw it overboard - bad PR!

I do about the same: Make "piddle packs" out of doubled ziplocs containing the pad from an adult diaper. That will completely absorb at least two good urinations. Also absorbs barf (yeah, after more than 30 years at this, I still occasionally get airsick).

Outlanded at a lonely little county airport once and got thoroughly interrogated and searched by a very young, completely freaked out sheriff's deputy (female version of Barney Fife). She was asking if I had weapons or drugs onboard when she spotted the "used" ziploc baggy pee bomb protruding from under the seat rim. She snatched it up and it was about two beats before she realized what she was holding. That significantly dampened her enthusiasm for further searching.