Instead of using jean legs, I had a piece of denim fabric from my sister's jean skirt that was shortened and the remnant has been sitting in my scrap bin for a while now. Actually, I had just tossed it in the garbage, a few days ago, as I didn't have any idea what to make with it. After seeing Bonnie's post, I went back into the garbage and took it out and made my thread catcher bags.
The only thing different is I sewed in a rectangular piece of plastic so that cleaning out the threads and bits and bobs will be easier. The plastic helps to keep the sides open.
Now, how is that for being crafty and recycling?
See the poster in the background? My SIL gave that to me after their trip to Alaska and to the Yukon a few years ago.
Have a great day!