Specification: Large storage space, large capacity main pocket for A4 magazines, everyday clothes and other items.Breathable back, comfortable to carry, back made of breathable sponge, soft, comfortable and breathable.Material: Polyester/canvasOpening method: zipperApplicable gender: neutralFunction: breathable, waterproof and wear-resistantWeight Dimensions: Three-piece set: 0.55kg;17 inch backpack: 0.30kg; 44*28*13cm Satchel: 0.18kg; 25*19*8cm Pen case: 0.07kg; 22*11*5cm The package contains: 1* Pen bag or1* Satchel or1*Backpack or3pcs (pen bag+satchel+backpack)Note:1. Due to manual measurement, there may be a slight tolerance of 1-3cm.2. Due to differences between different monitors, the picture may not reflect the actual color of the item.3. If you need to buy a three-piece set (pen bag + satchel + backpack), you must choose the SKU of 3Pcs. If you buy a pencil case, the package you receive will only be a pencil case, not a three-piece set.