This mochila bag is made using tapestry crochet (5 strands are used at any given time). It is made with single crochet (US terminology or double crochet UK terminology) through the back loop. It is worked in spirals so there is no need to slip stitch between rounds.

The bottom of the bag should lie flat and has 12 increases in each round from round 3 onwards.

This pattern includes graphs for left-handed and right-handed crocheters and written instructions for the bottom of the bag.