This pattern is for the more experienced Mochila makers. Your tension needs to be perfectly even to get this Mochila to look good.

A Mochila is made with single crochet through the back loop. You crochet over 4 yarns. This will make the bag firm. 

The pattern has 23 pages and includes:  
Written instructions for the Mochila technique. 
Links to videos to explain the technique. 
Written instructions and graphs for all parts of the bag. 
Pattern for a crocheted strap. 
Pattern for a plain weave strap. 
Instructions how to attach the strap to the bag.

This Mochila is about 25 cm / 9.8 inch wide, 17 cm / 6.7 inch high and 8 cm / 3.1 inch deep. The size can vary, because everybody crochets differently. If you use different yarn, measurements can be different.

A Mochila is made with mercerized cotton, 125 meter / 137 yards per 50 gram.

Materials used: (based on 50 gram skeins, of the recommended yarn) 
5 skeins yellow
2 skeins turquoise
2 skeins black
2 skeins fuchsia 
2 skeins pink 
Crochet hook between 2 and 2,5 mm 
Optional, Magnetic closure