School pencil tin for kids focuses on daily use in children's campus, accurately controls the size design, balances storage capacity, portability and adaptability, breaks the pain points of unreasonable size and messy storage of traditional pencil tins. Each set of sizes is scientifically calculated, fitting the size of primary school students' palms, schoolbag space and stationery specifications, making the size suitable for children's use habits. It is not only convenient to carry and take, but also can easily store various campus stationery, becoming a caring helper for children's campus life. The size design balances practicality and humanization, and every size detail is tailor-made for children, suitable for different grades and different use needs, allowing children to easily organize stationery and focus on campus study.

　　Size Core 1: Moderate overall size, portable and space-saving. The pencil tin adopts precise size design as a whole. The standard size is 20cm×8cm×5cm, the mini size is 16cm×7cm×4.5cm, and the extra-large size is 23cm×9cm×5.5cm. Three sizes are available on demand to meet the needs of children of different grades. The overall thickness is controlled between 4.5-5.5cm, thin and not heavy, and it does not take up space when put into the side pocket or main pocket of the schoolbag, and will not increase the burden of the child's schoolbag; the length fits the width of the primary school student's palm. The 20cm standard version is suitable for grades 1-3, the 16cm mini version is suitable for young children in lower grades, and the 23cm extra-large version is suitable for grades 4-6. It is moderate in size when held in the hand, convenient for children to carry and open/close to take, balancing portability and practicality.

　　Size Core 2: Internal partition size, orderly storage without mess. The interior adopts a scientific partition design, and the partition size is accurately adapted to various stationery specifications, bid farewell to the chaos of mixed stationery. The size of the main storage area is suitable for standard pencils, fountain pens and gel pens, with a length of 18-21cm, which can easily hold 10-15 pens. The pens are placed neatly and are convenient to take; the independent pen slot size is 1.5cm×18cm, which can separately place 2-3 commonly used pens to avoid frequent searching; the small storage grid size is 5cm×4cm×3cm, which can store small stationery such as erasers, pencil sharpeners and paper clips, and the size is small without occupying internal space; the hidden interlayer size is 19cm×7cm×1cm, which can store thin items such as sticky notes and class schedules. The partition size is reasonable, allowing all kinds of stationery to be in their own positions and cultivating children's sorting habits.

　　Size Core 3: Considerate detail size, suitable for children's use habits. The corners of the pencil tin adopt a rounded design with a corner radius of 1cm, which is round and smooth, avoiding sharp corners scratching children's delicate skin, and fitting the safety needs of children's use; the opening and closing size of the box lid is accurately calibrated, and the opening and closing angle is controlled at 120°, which is not only convenient for children to open and close easily, but also avoids stationery falling due to too large opening and closing of the box lid; the width of the box mouth is consistent with the width of the internal storage area, 7-9cm, no obstacles when taking stationery, children can easily reach out to take the required stationery without struggling to find; the bottom size is consistent with the top size, placed stably without shaking, not taking up too much space on the desk, suitable for the campus desk use scenario.

　　Size Core 4: Adaptable size, suitable for multi-scenario use. The overall size is suitable for children's schoolbags and desks. It can be easily put into the side pocket, main pocket of the schoolbag or the desk drawer without taking up too much space; the size of each internal partition is suitable for the stationery commonly used by primary school students. Standard pencils (17.5cm), gel pens (15cm), erasers (2cm×3cm), pencil sharpeners (4cm×3cm), etc. can all be perfectly accommodated, without worrying about stationery not fitting or size mismatch; the size design balances durability, the overall length-width-height ratio is coordinated, not easy to deform, and still maintains a regular size after long-term use, suitable for children's daily frequent taking and carrying needs. Whether it is campus classes, after-school tutoring, or outdoor sketching, it can be easily adapted, becoming a powerful assistant for children's campus life, and making every inch of size play a practical value.