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Roll the bag from the closed end as tightly and evenly as possible. Once you reach the top quickly tape the roll in place, first securing the middle and both ends and then adding tape to smooth out ragged edges. You should be left with a long thin bundle perfect for weaving with.
Unwind a length of garden twine to begin work. At first it won't be necessary to thread the twine onto a needle. Leave a small gap at the top of the plastic-bag-bundle and as shown wind the garden twine around the bundle to create a section around 2" long which is entirely covered in twine (steps 2 and 3). Carefully fold this section in half to form a loop and with help from a little more tape seal the loop (step 4). Now you can begin the first 'round'. Fold the carrier-bag-bundle around the central loop so that you begin to create the spiral shape. Passing the twine around the outside and through the centre you will create a strong central ring.
To form the second round continue to wrap the plastic bag around the central ring in a spiral, but instead of passing the twine through the centre thread the twine onto your needle and use the interlocking stitch. Thread the twine through the loop of each stitch in the foundation ring, passing the needle from front to back. The stitches should be even and close. In this way the whole basket is made up. To insert a new plastic bag simply roll and tape as before and tape to the previous bundle with an overlap of around half an inch for extra security.
Pass each end of the handle through the basket, two rounds below the top layer, and then tape the loose ends together. Make this connection nice and secure. To finish lift up the loops of handle inside and outside the basket and hold them together. Bind them in this position, as close as possible to the top of the basket, with more twine.