When you create a pack, you can decide what the “Visibility” is. You can choose “Public” or “Private”.
Public Packs will be seen in Community Packs (under the “Explore” menu item). NOTE that your public pack must have at least five members to be seen in Community Packs. Be sure to select a category for you pack also.
Packs whose visibility is set to “private” it won’t be seen by anyone except yourself and members of the pack.
Whether your pack is public or private, anyone you add to the pack will be alerted to the fact that they have been added to your pack.