When new items are added or deleted from groups or areas, the app could "learn" this. Not sure how u would associate this new item with an activity. Maybe the app could ask when the item is entered. Or maybe a database of common items could be added so the item is recognised.
Also the ability to edit items. Some items are close to what I need but being able to edit the wording slightly would be great.
Job specific data bases or activities. Or businessman or aircrew or causal backpacker. Developing the data base and asking more in depth questions would allow more accurate packing lists. Overall I love the app. It is a fresh innovative approach to this task. I travel internationally on a regular basis. The other apps in this category are boring, over complicated and simply not easy to use. The most important interface, the act of clicking the item, needs to be easy and the action clearly acknowledged by the app. Flashing the entire bar of the item selected would be great. Showing that item has been added or ticked.
Swiping in a different direction too edit or add additional options would be good too.
Thanks again.

Based on pack list for female,

Work/Business Formal
Work Pants are generated as many amount as Work Shirt -- definitely looks like a man's pack list instead. Perhaps it should be replaced or balanced out with Work Skirt and/or Work Dress. Arrange/group these items together so use can easily view and decide over which they need

Hosiery - number should be intelligently generated based on length of stay, the same as the app would have generated for Work Socks

Essentials Items
Bra - number should be intelligently generated based on length of stay, the same as the app has generated for underwear