Bold fabric bottom, not sliding during driving.The storage box can folded into small size, when it is not used, to carry out, not occupying much storage space 1680D thick Oxford cloth, wear-resistant, waterproof and storage, items is not placed in a disorderly manner Using three-layer fabric, it have strong and will not collapse after long-term use 600d oxford fabric, with good waterproof function, wear resistant, owning long using lifespans