• Binder with refill that includes 100 squared A4 sheets (21x29.7 cm) of 5x5 mm, easily removable or interchangeable. • High thickness sheets (90 g/m²) that prevent ink from bleeding through. • 4 colored dividers to classify documents by subjects or topics. • 4-ring system and internal compressor to keep sheets organized and secure. • Elastic closure that protects the contents inside the backpack. • Expanded dimensions of 28x32x4 cm, providing extra space without losing manageability. • Transparent inner pocket to store loose papers, notes, or small accessories. • Durable materials: hard cardboard exterior and laminated finish, ideal for daily school or home use.