Please keep this topic going! I've got a good 20 or so of these tubes and really hate just tossing them in the garbage... and there's no recycling here.
Of note, the drink mix containers are plastic('ish) and very light. Filling them with pens and pencils is a great idea, but does make them top-heavy and very easy to topple over.
The tubes are about 6 1/2" tall with a diameter of 2 5/8". They are almost always translucent white but may have different colored (and labeled) tops.. Wyler's Light tops are blue.
I've switched to single serving drinks because there's no more room for these tubes!