I have this kind of pot, not inherited from my grandma and even from my mother. It’s mine 
Within there are unpicked buttons from garnments that can’t be saved and spare buttons. So, there are a lot of “orphan buttons”. I always think that I will sort them by colors but never take the time to do it 
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I use a similar box, but a larger size. Each compartment contains a different color button. The compartments can be different sizes based on moving the little dividers around. I think it is an old JoAnn’s purchase years ago.
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Vernier callipers - genius - so fed up trying to measure my buttons with a tape measure. Off to find some of them
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@Foxy126 I got mine on eBay 
. I bought 3-4x and left one in my sewing room + each of my different handbags so is ALWAYS have one on me haha
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@Foxy126 snap 
on the multi-compartment organiser style boxes 
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