Lists allow easy organization of the who, what, when, where of packing.
You'll easily organize the group list, but also you're able to have a checklist of your personal items. For both lists you're able to cross out individual items. Check off items as you pack!
Everyone on the trip has access to the group messenger/chat.
Organized real-time group communication in one place. No need for SMS, emails, apps. Everything can be done on one screen.