We have adapted our Active-Comfort fit carry system to the specific needs of first and second grade school kids. The ergonomically shaped pads snuggly fit the small backs, provide optimum weight control and easy carry. Thus the OneTwo promotes the kids’ natural desire to be physically active.




Children are curious and exploratory by nature. They enthusiastically explore their environment step by step by constantly gaining new experiences.
During the intensive growth phase of children and adolescents, often times back pain occurs. This makes it all the more important to build muscles around the spine to ensure a healthy back.

Movement and sports promote bone growth, strengthen the back of the children and evidentially counteract back pain. Parents can support the healthy development of their children and strengthen their backs in a double sense by giving the children time and space for regular movement.

Everyday physical activity, such as the way to school by foot or by bike and a moderate strain, such as wearing the schoolbag, supports the development of important core competencies like self-confidence and self-assurance and should not be taken away from the children. With confidence "in their back" children grow with their tasks and learn to take responsibility for themselves and for the content of their backpack.

Running, jumping, climbing, bouncing, swinging, balancing - of course also on the way to school - means you need a good school backpack on the way. A backpack that fits appropriately on the back and that does not hinder the kids in their activity. The concept of our robust school bag Ypsilon takes these findings in two respects: on the one hand, the Active Comfort Fit wearing system supports the natural need for movement of the children and on the other hand, a healthy muscular and bone growth is promoted by it.


How much can a school backpack weigh?

According to DIN standard 58124 it is recommended that the weight of the school backpack should not exceed 10 to 12.5% ​​of the child's body weight to prevent irreparable postural damage. But where do these values ​​come from? Investigations have shown that this recommendation dates from the time before the First World War. It once referred to the maximum weight of the recruits' packs, so that long-term strains (marches over 20 km) could be completed without muscular fatigue symptoms. Transferring this value to the children's school backpack weight appears rather unrealistic and is not scientifically justified.

A study by the University of Saarland (project Kidcheck, investigated the extent to which a school backpack's weight which is considerably higher than the stated 10%, affects the physical education of primary school children. Each backpack weighed an average of 17.2% of the children's body weight. The task of the students was to complete an obstacle course with the pack on the back. This should simulate a "strenuous school way". Although the backpack was heavier than the recommended 10%, no significant fatigue symptoms of the trunk muscles could be observed. Rather, the higher weight led to an increased tension of the abdominal and back muscles in order to stabilize the body. The spine was thus again relieved.

Healthy, active children in the muscular development phase can tolerate a body weight of up to 17.2% of their body weight.

In fact, the development of musculature and bones of the children even requires a moderate strain. In order for the child to be optimally supported when carrying it, it is important to pay attention to the correct wearing behavior and the load distribution. The center of gravity of the backpack should lie close to the body and, if possible, in shoulder height so that it is always above the center of the child's body and does not pull backwards when worn. Parents can help by controlling at regular intervals the content with their child, and by thinking about what things could stay at home or at school. The carrying straps must be tightened so that the backpack is close to the body. One-sided wearing leads to distortions in the spine and muscular tensions. Therefore, the weight of the backpack should be distributed on both shoulders.