Great idea! Thanks for submitting it. We have part of this implemented now, but not all of it quite yet.

For example, if you press the share button for your packing list, you can choose to share it via e-mail and you’ll see a link (here’s a screenshot – http://note.io/1smAP6A). You can use that link as a reference for your packing list from any device, but it doesn’t have interactive checkboxes.

Another option is the Evernote sync function. This is a new feature that we’ve recently implemented for this very use case. If you want to have PackPoint make the packing list for you, but you want it sync’d across all of your devices, then Evernote can help you do that. This available now on Android, and coming soon on iPhone. (here’s a screenshot from an Android phone – http://note.io/1BBswfM)