A randoseru (ランドセル^?) is a firm-sided backpack made of stitched firm leather or leather-like synthetic material, most commonly used in Japan by elementary schoolchildren. Traditionally it is given to a child upon beginning his or her first year of school. The term is a borrowed word from the Dutch "ransel" meaning "backpack", a clue to its origins nearly 200 years ago as used in the Netherlands.

Since 2001, 'randoseru' has become a part of fashion for grown-up girls, especially for those who love ' kawaii ' items.

Most randoseru production is carried out by hand. A randoseru is constructed of a single-piece body and around 200 fittings, a combination of die-cut materials and urethane backing plates. Assembly involves crimping, machine-sewing, walnut-gluing, drilling each shoulder strap, and riveting.^[2] The bag's materials and workmanship are designed to allow the backpack to endure the child's entire elementary education (six years). However, the care usually given to the randoseru throughout that time and afterwards can extend its life and preserve it in near-immaculate condition long after the child has reached adulthood, a testament to its utility and the sentiment attached to it by many Japanese as symbolic of their relatively carefree childhood years.^[4]

from https://en.wikipedia.org/wiki/Randoseru