As my avatar may suggest, I am a sailor too. Years ago I worked in experiential education at a school for gifted children with learning disabilities. I ran an active sail training program, teaching the kids to sail in sloops, and then once they were ready take them on a tall ship, week-long expedition voyage through the Channel Islands off the coast of California. It was an amazing experience and developed the kids socially and intellectually. I probably have as much underway time in schooners and brigantines as I do in sloops. Day trips in sloops were did not pose any problems for my used diapers as I never needed to change on board. Fortunately, as the senior educator and expedition leader I shared a cabin with the sailing vessel's captain and had all of the privacy I needed...just bagged my diapers and stowed them with the rest of the vessel's trash.