The twin draft guard is basically a door snake like people have been using for years. But, this one has the added advantage of staying with the door when you open and close it. After using a traditional snake (which I also made myself) for one winter, I know how much of a pain it is to move every time you move the door.
This project can probably be completed in around a half hour. It's free as long as you have some scraps and basic sewing supplies lying around. See step one for more details.
Step 1: Gather your supplies
1. Scrap fabric - You'll need something about 12" by 35". You could patch pieces together if you don't have a big piece of scrap. This could really be any kind of fabric; I used some felt but you could even use some old clothes or something.
2. Something to stuff it with - Real stuffing is probably best. You could also use some type of foam, maybe some cotton balls, or some smaller scrap pieces.
4. Measuring Tape
6. Needles for hand sewing
7. A sewing machine is also helpful, but you could just do it by hand if you'd like.
8. Something to push the stuffing down with. A pencil could work for this, I used a hard plastic drink stirrer that had knobby ends.