To make this bag you will need:

Approximately 300g Aran weight yarn and the appropriate hook (I used a 5mm)
A darning needle
Fabric to line the bag if you want to.

This pattern is written using UK crochet terms. Stitches used are:
Chain (Ch), Double Crochet (DC), Half Treble (HTr), Back Post Treble (BPTr), Front Post Treble (FPTr).
BPTr and FPTr are made in the same way as a normal Treble but going around the post of the stitch (either from the front or back) rather than into the top of the stitch.