Bike Pannier Bag with 3 in 1 Multifunctional Design. (Comes with 2 side pannier bags and 1 backpack)can be used independently,convenient for versatility Material Made of 1680D polyester material.water resistant and durable.With a rain cover. Avoid your bike bag away from wet on rainy days when cycling. Large capacity The backpack:18.1"in L*12.2"in W*5.9"in H.The two side shoulder bag:11.4" W*5.9"D*13.4"H . Fully expanded to hold more. Easy to install Bike trunk bag with hook-quick release system, easy to be fixed on rear rack. Removable Shoulder Strap for one side shoulder bag There is an adjustable nylon shoulder strap in the package, with easy locks on both sides, the strap can be installed and removed effortless, and you can carry the bike pannier on the shoulder while not cycling.