If you want to knit a handbag from plastic bags, you first need to know exactly how to prepare the plastic bags. This article will show you how to make the polyethylene tape needed to create "polyethylene yarn" from which you can crochet or knit a new bag.
Steps

Step 1. Cut the seam at the bottom of the bag

Step 2. Expand the package completely
Spread it flat.

Step 3. Fold the bag almost halfway across (the fold should be perpendicular to the cut bottom seam)
Leave a strip about 2.5 centimeters wide at one end. Fold the part that you have already folded halfway down. Keep folding this part of the bag over and over until you have a strip about 2.5 cm wide.

Step 4. Cut off the bag handles

Step 5. Cut the folded part of the bag into transverse strips approximately 2.5 cm wide
You need to cut through all the layers of the folded portion of the bag, but be careful not to cut the remaining free edge of the bag.

Step 6. Take the bag by the free, not cut edge and shake well
The folded portion of the bag will unfold into a cut fringe.

Step 7. Unroll the frequently uncut bag and flatten it flat
It will be easier if you place a piece of cardboard or cardboard tube under this part. This will ensure you don't accidentally cut the resulting strips.

Step 8. Cut diagonally from the fold of the solid edge to the nearest cross cut

Step 9. Continue to cut this part of the bag diagonally, joining adjacent cross cuts

Step 10. The last cut will be similar to the first one and will reach the fold in the middle of the free edge
Your plastic bag has become a solid, long, thin plastic tape.

Step 11. Roll the plastic tape into a ball
Now you can knit something out of it, like a sturdy shopping bag that you can reuse.
Advice
- You can use this method to turn old T-shirts into knitting yarns. From it you can knit soft chair seats, pet mattresses and small rugs.
- Try using bags of different colors for a rainbow effect.
Warnings
- Keep plastic bags out of the reach of small children. The child can put the bag over his head and suffocate.
- Don't forget about cats, which like to swallow things that are not intended for this at all. Swallowing polyethylene yarn can cost you a lump sum in veterinary fees.
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And about cats - claws and polyethylene yarn are incompatible.