If you're looking for ease of use when traveling, I use a 3-ring binder with pages that were sold as "slide projector slide protector sheets" with individual pockets for each slide. I'd keep majority of the dubbing in its ziploc-style bag and take a small sample of it to go into the 3-ring binder sheet. Restock the sheets as necessary. It is great for travel, but if you are looking for a single storage location, this may not be for you - you can only store so much dubbing in those slide pockets before it starts to fall out and get ugly.
Just my experience - your results may vary
Let us know what you do decide to go with, and how it works for you.
-Pete