Materials and tools:

Raffia yarn (for example, Ispie) 1 skein, 250 meters;
Hook N3 - 3 mm;
Rigilene boning, 5-6 mm, 60 inches (11/2 meters);
Shoulder strap 39-47 inches (100-120 cm) with 2 snap hooks. The shoulder strap can be crocheted. In this pattern there is a link to the video, how to crochet the strap;
Valve with button;
2 snap hook rings, 20 mm;
PVA glue;
Sewing needle and thread;
Scissors;
Lining, 2 circle, diameter 65/8 inches (17 cm).

Iron.