Why don’t you make a tutorial?

@@ctrichell why would I? all I was doing was asking questions about her methods. bc I am still somewhat new to sewing and have questions. Questioning someone is NOT, i repeat NOT, putting down their work. it's curiosity of why they did something in a particular way or didn't do something in a particular way. Asking questions allows a person to learn so that they can become more knowlegable at whatever they are trying to do. Just because i don't want to be part of a flock of sheep and just follow what someone says without asking questions doesn't mean i think my way is better. it means i want to know why she did it her way? it means i want to learn. 1) I learned how to sew by hand before learning to sew with a machine. and from experience i would much rather do a ladder (invisible stitch) stitch for a couple of inches than than a whole side. to be frank you really don't need more than that to pull it through. 2) i REALLY don't know the purpose of the extra piece of cloth and why it's needed. cloth is expensive, i don't want to waste any of it. I don't waste any of it, not a snippet. anything too small to use gets turned into stuffing for dog/cat beds for the vet's office in my home town. i've never seen anyone else use it and i wanted to know her purpose for it before adding it. I wasn't insinuating it was wrong i just wanted to know. 3) However the last question i worded incorrectly and it came off more like a statement.i shoulded have asked why she didn't make a diagonal stitch going in both directions since it wouldn't affect how it will look asthetically, how it works, and it will make it last longer? Because that really does just baffle me.

I would sew as you suggest: 1) Start sewing the ‘sandwich’ about 1-2” from the bottom, then around three sides, and then sew 1-2” from the top. So you have a hole for turning inside out, and the edges are already aligned for easier hemming. 2) I would topstitch around the whole thing 1/4” or less around the four edges. 3) I would also do diagonal stitching to make diamond shapes to help hold all layers together. This will help keep the layers together, when twisting the jar tops. Unsure about the three layers compared to using just 2 - maybe it is so when viewed from the grippy side, a right side of fabric can be visible behind the grippy stuff, rather than the back side if just one piece of fabric is used?

6 inches square

as it is a rubber mat i would either air dry or put on low heat and even at low heat it may get a little tacky