The multifunctional bag provides all-in-one solution during cycling trip.Good cycling partner for you! Features: Made of water-resistant fabric and zippers,you can use the bag freely on rainy days. Pack your things into the bag,and roll the opening for three times,then fasten the buckle belt. 3-in-1 design,it can be a bike pannier bag,a backpack or a hand carry bag. Invisible back fastening clips allow the bag to be attached to most standard bike pannier racks. Fixing buckle belt can be firmly tied to the bicycle tube. Detachable shoudler straps to install and remove easily. Top carrying handle provides easily carrying and hanging. Reflectors provide increased visibility during nighttime activities. Taillight loop to easily attach your light(not included) to the bag for safe nighttime cycling. Flexible chest strap provides comfortable wearing experience. Built-in a whistle,which can be heard by rescuers from a far distance. Spacious main compartment and front zipper pocket to store your cycyling gears. Specification: Material: PU Size: 30*18*50cm / 11.8*7.1*19.7in Weight: approx. 392g / 1.9lb Package List: 1* Backpack (with a pair of shoulder straps)