Here's how it's done
Cut your Fabric cut according to the desired bag size. Halve the width of the fabric and fold it inside out (the good side of the fabric inside). Baste the two halves of the fabric together at the sides, with a seam allowance of about 1.5 cm per side.
Now fold the narrow fabric edges along the resulting opening about 2.5 cm, fix the fabric cover with Pins and in a second step fold the fabric edge into the cover so that it is no longer visible. Sew as close as possible from one side seam to the next along the edge of the fabric. This creates a drawstring through which the closure tape can be pulled later.
Turn the resulting bag to the right.
Now the two lower corners of the bag are fitted with metal eyelets . The metal eyelets are usually delivered including punching tools. As described on the eyelet packaging, a hole is first punched in the fabric with a hammer or eyelet pliers. The eyelet is inserted into this hole and fixed with a hammer and the supplied tool.