well, as usual, i bought it for one thing, used it for a few years on my computer and then decided one day to put under my serger as it vibrates all over during marathon serging sessions... it was so good that i bought more and now am thinking about buying 2 more so i can double up under the serger and machine... they really quiet the machines that that's enough reason to have them, but he button/grocery bag thing was an afterthought one messy serging day (serging towels equals a TON of lint!).... and then of course a few months later the quilting strips kept getting messed up in my chair wheels .... otherwise all known as an 'Evolution of a Sewing Tip!'