Ikeda-ya Randoseru (School Backpack) Kata Pita Pad (Shoulder Fit Pad) Color: Brown Retail Price: 1800 yen Used for about 5 days of school, but no longer needed, so I'm selling it. Washed. From the official website: Provides cushioning until the straps conform to the shoulders. Also prevents sweat and stuffiness. The Kata Pita Pad, a separate part for Ikeda-ya randoseru, is recommended to reduce shoulder strain and for summer sweat対策 (measures against sweat). New randoseru shoulder straps are still a little stiff. You can use it as a cushion until the straps conform to your shoulders. Made of mesh material, it is breathable and reduces sweat and stuffiness, helping to prevent heat rash.