Why packing lists are worth getting right
Forgetting your phone charger is annoying. Forgetting your passport is a different kind of day. The difference between a good packing list and a bad one is specificity — and the 'flag commonly forgotten items' instruction is what makes this prompt different from a generic list. For international trips it'll flag things like travel adapters, printed hotel confirmations, and copies of your passport. For beach trips it'll remind you about reef-safe sunscreen and a waterproof phone case. These are the things that don't make it onto generic lists.
Carry-on only changes everything
If you're flying carry-on only, include that in the prompt. The AI knows the TSA 3-1-1 liquid rules, knows which clothing items are most versatile for multi-day trips, and will adjust the clothing count to match what realistically fits in a standard carry-on. Follow up with 'what are the most versatile clothing items for this trip?' and it'll help you build a capsule packing system rather than just a list.