1Adopt 500D polyester and double-sided PVC composite pressure-resistant structure, anti-tear, wear resistance and waterproof. 2Waterproof material, stain resistant, easy to clean. 3With large capacity, the trunk bag has 27L capacity after expansion, which can meet the needs of carrying items for long distance cycling. 4Both sides of the pack adopt reflective design to guarantee the safety of night riding. 5Thickened and reinforced hooks are suitable for most shelves.