I use this as a motivation to never forget my reusable bags. Every time I forget them and end up bringing a plastic bag home from the store, I have to save it and eventually crochet it into a reusable bag. This has worked on me. I am getting really tired of crocheting plastic.
My stupidity and lack of discipline has paid off, though, in that I think I've nailed down the elements that make up a good, sturdy plastic bag bag. The flat, structured bottom lets you set your bags on the counter for easy packing and unpacking, and the attached handles are strong enough even when the bag is loaded down.
I am way too stupid and lazy to count stitches and come up with an actual stitch-by-stitch pattern, so you will have to eyeball things a little as you go along to get it the size and shape you like.
What you'll need:
A whole lot of plastic shopping bags
Crochet hook, size N
Step 1: Make plastic bags into yarn
First, flatten your plastic bag as neatly as you can.
Keeping the bottom seam as flat, fold the bag vertically until it's maybe an inch wide, as shown in the second photo.
Snip off the bottom seam.
Cut the bag into strips anywhere from about .5 to 1 inch wide. This doesn't have to be perfect, and it doesnt' have to be consistent, so as long as the strips are thick enough to stay intact, and thin enough to work with, as in the third photo here.
Unfold the loops and connect them by using a girth hitch, described here. Pull the previous loop taut before attaching the next, so the loops are evenly spaced.