Store your carry-on items while you're riding, such as your phone, phone charger, wallet, cable, earphone, power bank, map and so on.Product name: Multifunction Expandable Waterproof Bicycle Rear Seat BagUnstretched size: 35 * 23 * 19cm/ 13.8 * 9 * 7.5inStretch size: 28 * 23 * 34cm /11 * 9 * 13.4inMaterial: High quality waterproof fabricCapacity: 25LColor: Black / Black & Grey optionalPacking list1 Bicycle Bag1 * Rain Cover1 * StrapNote:1 Please check the size and color before purchasing.2 Does not include items other than those shown in the product photo.3 Please note that due to the different monitors, slight chromatic aberration may occur, please understand.4. The above data is for reference only, the size is manual measurement, each variable may be different, please refer to the actual product, thank you.5. If you find any problems with our products, please feel free to contact us by email and we will resolve the problem as soon as possible.6. Welcome your sharing and feedback so that we can provide you with better products and services.7. Thank you for visiting my store, click to enter my store, there will be a lot of products for your reference