My sister hipped me to this awesome tip, so I thought I would share it with everyone on the blogosphere. Where and how do you store your tubes of watercolor paint? I just store mine in a quart-sized Ziplock bag...
But, Staples (you know--the guys with the "Easy" button...) sells a plastic box with a snap closure that's intended to store 3" x 5" index cards. However, It holds watercolor tubes perfectly! The index-card-storage boxes come in a translucent white (shown above) and also colors. Cost: about $1.50 USD. I haven't been able to find them on their website, but they are available in stores.
This little plastic box offers a rigid storage solution that's perfect for traveling with your tubes of paint, helping to prevent crushed tubes and consequent messes. Let me know if this tip works out for you!