[Capacity] 10L (water bag can hold 2-5L)[Weight] 390 g， ultra high quality.[Size] 11 * 24 * 45cm[Material] high-strength nylon fabric honeycomb lattice and wire lattice. The back according to ergonomic principles， so that the spine from oppression and breathable. Comfortable. With belt and chest buckle plus bag， can be completely hands free. But also to replenish moisture， making riding more focused， more secure. (Note: This price does not include water bag， purchased separately)