The Kangaroo from the pictures is made using Himalaya Dolphin Baby yarn (at least 2 skeins of the main colour) and a 4.0mm size hook, and YarnArt Jeans with hook 2.2mm for details (eyes). My plushie, made with these materials is about 40cm (16 inches) high) with ears. Of course you can use any yarn you like. The pattern also says how to make the version without a bag or with the flat bag.
The pattern is meant for the beginners and intermediate crocheters.