My wife is a phlebotomist. She requested a way to strap the blood tubes on her arm and this is what I came up with. She used it for the first time last night and was in love with it.
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You and another person said the same thing. Really surprised something like this isn't common place already. A quick search shows cloth versions of this with elastic which seems dubious at best.
This is a better design. One is always reaching for the next tube. With this it's easily, and safely within reach. Awesome!!