A couple of years ago I bought a cheap little sports bag at a rummage sale. I've used it almost daily to transport my mouthpieces and other tuba stuff. One of the zippers 'gave up the ghost' so I've been looking for a suitable replacement. I've tried most all of the conventional mouthpieces pouches but they just don't have enough room for all of the other stuff I like to keep around. I found this one at a military surplus store today for $12:
http://www.foxoutdoor.com/detail.asp?bid=60
It's quite small but still has plenty of room for three mouthpieces in their pouches, a half-dozen clothespins, valve oil, tuner, small screwdriver, earplugs, small flashlight, mouthpiece brush, and a pen or pencil.
Dan Schultz
"The Village Tinker"
http://www.thevillagetinker.com" target="_blank
Current 'stable'... Rudolf Meinl 5/4, Marzan (by Willson) euph, King 2341, Alphorn, and other strange stuff.