You will need:
- old t-shirt
- a good pair of scissors
- a sewing machine and thread
A youth size or adult small will make a reasonably sized shopping bag. An adult medium or larger will make an awkwardly sized shopping bag, but I use it as a laundry bag.
Step 1: Cut It Out
Next you'll want to cut off the collar area. You want the shoulder area to be about 2-3 inches wide on each side. Don't cut too low or your bag will be small (unless that's what you're going for, in which case you may want to make the sleeve cuts deeper). If there's a logo, you can try to adjust your cut, but make it as symmetrical as you can. Remember, it's really easy to cut more off, but not so easy to add more on.
Once you've made your three cuts, proceed.
Step 2: Pin It
Fold two inches of double-layer fabric from each edge (one at a time) and pin it down. Make sure the edges are as even as you can get them. I used two pins.
Also pin the rest of the hem together.
Step 3: Sew
Sew along the bottom of the t-shirt, right outside the hem. You may want to go back over it a second time for extra strength. Up to you.
Step 4: Finish
That's all you have to do. Decorate if you want. Otherwise, enjoy using a reusable, recycled, eco-friendly bag rather than a paper or plastic one.
Also see my other instructable on making bleached designs. It's easily done with a t-shirt bag too.