[High-quality waterproof and tear-resistant fabric]The bicycle trunk bag is made of PVC+polyester+210D lining waterproof coating fabric and PU. The laminated waterproof zipper design is not only tear-resistant and wear-resistant, also prevents water splashing, , dust, etc. from entering the bag. Exquisite workmanship, durable and . The best for commuting, cycling, outdoor, travel, hiking. [30L capacity storage space]Size: 36x16x56cm.The main compartment is partitioned for storage,with 11L of storage space expansion, and 30L of storage space after bilateral expansion. The capacity of 30L is enough to your phone,wallet,books,water bottles,tools,food and other daily necessities. The bike bag includes a main compartment, 2 expandable side pockets that can be freely partitioned according to your needs. [Multifunctional bicycle rear bag]The bicycle bag can be fixed to the rear of the bicycle. The top of the bag has handles and can be used as a tote bag. The travel bag is equipped with a shoulder strap, which can be adjusted in length and can also be used as a shoulder bag or a bag. (Bicycle bag, backpack, can be switched at will) [Tool-Free bonding Installation]Easy to install and uninstall in seconds, simple and convenient. Compatible with most bike racks, such as regular bikes, mountain bikes, e-bikes, etc. Colour:black :PVC+polyester+210D lining Package Contents: 1 x Bike bag Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.