When creating the filename, take a moment to make it useful. I would suggest at a minimum including your name and a numeric date in ISO order so that people don't have to rely purely on having just followed your link to it. After all, not everyone is going to open it up right away and there are going to be people who send copies to friends.

As a basic name format, I will suggest ArtistName_YY-MM, (e.g. for something this month it would be JRFurryartist_25-01).

It's probably also a good idea to make sure to include a pointer to your galleries, for people who don't get the pack directly from you.