The pattern for the Blooming Backpack is written in US terminology, and uses stitches like: chain, single crochet, half double crochet, double crochet, triple crochet and slip stitch.

I made my backpack with a 4 mm hook and less than 400 grams/960 meters of yarn. The final measurements of the backpack using a 4mm hook are;
Width: 25 cm / 10 inches
Height: 35 cm / 13 inches
Depth: 8 cm / 3 inches

But my testers proved that it is possible to use other sizes of yarn/hook as well.

The pattern includes written instructions and photos that teach you how to make your own version of the Blooming Backpack.