I have file pacs and the travelling inboxes, I like 'em a lot, but I did wait until some discontinued colors were available on their website. Much better at half price. I have set up one travelling inbox as my travelling tickler file, and the other is travelling project support material (contains a filepac for single papers).
Between home, school, work, and being away from home at least two nights a week, being able to pick up and go is critical for me. I use the other filepacs for files I know will be hauled around and have some wear and tear. For example, when I was setting up a friend's web site, all the project support materials for that lived in the filepac which stayed in my briefcase, rather than being filed in the filing cabinet.