This is a charted pattern from German yarn manufacturer, Schachenmayr, available for free in German from the company’s website. There are no written-out row-by-row instructions.

Materials:
350 (400) g of Schachenmayr Catania in “Hellblau
Fb 173” (Pastel Blue) for the top, 150 g for the market bag

Tools:
Milward crochet hook 3.5–4 mm and Nr. 5,
one set of bamboo rings 15 cm diameter (manufacturer/supplier information in pattern)

This pdf pattern is still available via the Internet Archive.