I've liked it when I've used it, it's just too small for most use cases, so I wind up carrying a keychain container anyway.
Have you considered making just a cap? Cut down the extra length and make it a bit smaller to carry around.
Hey all, like most of you I've been thinking about cap storage solutions, has anyone tried putting the centrifuge tubes inside a metal key fob? Would solve the rattling issue while being more convenient to carry than the tubes.
Quick shout-out to all the great info and contributors in this...