The phrase "nappy bag" refers to a bag or backpack that is specifically designed to carry items needed for a baby, such as diapers, wipes, bottles, and clothes. Full definition
Yes... ideally your toddler would do a huge poop at the airport before the flight but unfortunately we can't control their toilet habits, to make things a tad easier I created nappy bags sets. (mybump2baby.com)
Cotton wool balls / pads & small pot Baby towel Eco Nappies Nappy bags Disposable changing mats 4 Baby bodysuits 4 Sleepsuits Muslin squares Baby Cardigan Scratch mittens Baby socks or booties Baby hat Baby blanket Jacket or snowsuit in winter Baby car seat (charlottekeating.com)