This Mochila is made with single crochet in back loop. You crochet over all the yarns. This will make the bag firm.
A Mochila is made with mercerized cotton, 125 meter / 137 yards per 50 gram.

The pattern has 25 pages and includes: 
Written instructions for the Mochila technique.
Links to videos to explain the technique.
Written instructions for the bottom with 10 and 12 increases.
Graphs for the bottom for 10 and 12 increases. With the increases marked.
For the side pattern there are written instructions and a graph.
Pattern for a kumihimo cord.
Pattern for a crocheted strap.
Pattern for a plain weave strap.
Pattern for a 3 color pick up weave strap (This is an advanced weaving technique).
Instructions how to attach the strap to the bag.

The diameter of the bag will be about 20 cm / 8 inch and the height of the bag will be about 27 cm / 10.5 inch, with the recommended yarn.

Materials used: (based on 50 gram skeins)
2 skeins dark blue
2 skeins middle blue
2 skeins light blue
2 skeins orange
2 skeins yellow
Crochet hook 2 - 2,5 mm