1. Specifications: - Project type: Bicycle rear seat bag - Material: Polyester - Color: Black - Weight: Approximately 349 grams / 12.3 ounces - Product dimensions: Approximately 38.4 x 16.2 x 16.2 cm / 15.1 x 6.4 x 6.4 inches 2. Features: - Waterproof material: The bicycle rear seat bag is made of waterproof and durable polyester material, which can effectively prevent rain, water, dirt, and dust from quickly entering the bag. - Main compartment: One main compartment with a capacity of 12 liters can store clothes, books, or other daily necessities. Both side pockets have enough space to place your items. - Small pockets: There are 6 multi - functional small pockets, which can store portable items such as mobile phones, mobile phone chargers, wallets, cables, earphones, power banks, maps, etc. during cycling. The buckle straps are sufficient to fix the bicycle bag on the rear seat, ensuring that it will not move even when cycling on uneven roads. - Flexible shoulder straps: The length of the flexible shoulder straps ranges from 36.2 to 60 inches (91.4 - 151.4 cm), and the tightness can be adjusted to perfectly fit your body. - Top handle design: The top handle design of the bicycle rear seat bag is convenient and comfortable, and you can change the carrying method as needed. 3. Package list: 1 bicycle rear seat bag