I came across this great little travel palette while randomly browsing art supplies today.
It's only 1/2" x 2 3/8" x 3 3/16". You can fill it with your own choice of 12 colors and it has a thumb ring on the bottom. This would easily slip into a zip-loc bag to make it travel proof. I think it would work great with Daniel Smith's new Grab & Go Watercolor Travel Set.
Get it at Wet Paint online and be ready to paint outdoors this spring! (or in your car if you live in the great wet Pacific NW--we still count that as being outdoors.)