Nowadays, a problem of Thai primary students is to
carry a heavy school bag relatively to the student
weight. The school bag carrying task can be classified
as a carrying workload. This workload was evaluated
based on a biomechanical static model. 346 primary
students (178 boys and 168 girls) aged between 6 to 12
years old were recruited voluntarily for the research.
Average school bags weight was 11.76% of the body
weight (BW). The results showed that the body weight
is not significantly relate to the body strength (R