The purpose of this study was to evaluate the effect of different backpack loading systems on trunk forward lean angle during walking among college students. Twenty six students (age 22.41 years) participated in three test sections in three different days. Trunk Forward Lean angle was examined in seven phases of walking with three different conditions (unloaded walking, walking with normal backpack and walking with counterbalance backpack). Participants after 10 min warm-up walked 10 min on the treadmill in different days and different conditions. To analyze the data for trunk forward lean angle in seven phases of walking with three different conditions using a Multivariate Analysis of Variance (MANOVA). A significance level was p<.05 for this analysis. The post hoc test adjustment was then carried out to confirm the significant differences. The results indicated that unloaded walking condition with counterbalance backpack condition and the normal backpack condition differed significantly (p<.05), but there is no significant difference in phase MSW between without backpack and counterbalance backpack conditions. Finding of this study clearly showed the advantage of counterbalance backpack. According to finding of this study the counterbalance backpack allows person to upright position, by shifting the center of gravity of the load forward.
