This bike rack bag can be changed to a bike pannier bag by unzip the top zipper and the two side zippers when you need more capacity. The capacity is 11L, 17L, and expandable to 30L.
Waterproof: The bike trunk bag is made of waterproof material, water laminated zipper, Comes with a rain cover.
Removable interior thickened pad which reduces shock and you can store products such as camera gear, etc.
Removable Shoulder Strap: There is an adjustable nylon shoulder strap in the package, with easy locks on both sides, the strap can be installed and removed effortlessly, and you can carry the bike pannier on the shoulder or by hand while not cycling.
The water bottle holder with adjustable drawstring to tighten the bottle in place.