This 2-in-1 backpack set is specially designed for boys, offering two sizes, 14 inches and 15 inches. The 14-inch one is compact and lightweight, about 35x28x12cm (13.8x11x4.7 inches), suitable for lower-grade kids to carry stationery and textbooks. The 15-inch one has more space, around 38x30x18CM (15x11.8x7.1 inches), capable of holding more study materials. The matching pencil case, measuring about 20x9x4cm (7.9x3.5x1.6 inches), has excellent storage function. The backpack is made of high-quality, wear-resistant fabric with good waterproof performance, and its zippers and stitches are firm and durable. The back and shoulder straps are padded with thick sponge, and the adjustable straps adapt to different heights, reducing the burden on children. It's a great helper for boys' study and daily outings.