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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.

My buttons rattle in their slot a tiny bit but if I hold them still no rattle at all.

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...