Product Description: Multi-functional - Designed to adapt to different scenarios and switch freely from a handbag to a shoulder bag to a pannier bag. Material - Made of 100% high-quality polyester that is water resistance and durable. High-Capacity - Large layer for easy storage. Conveniently stores 15 inch laptop, helmets, tools, clothing, and other necessities. Keychain - Retractable key chain ring so your keys stays secure and won't get lost. Easy Installation - Simple step installation. Simply attach the strap to the bike carrier, connect the strap with the buckle, then tighten the buckle in the middle of the bag. Size - Folds: 42 x 15.5 x 25cm, Capacity: about 18L; Unfold: 42 x 15.5 x 52cm, capacity: approx. 33L. Available in Black or Green Camouflage. Product Details: Material 100% Polyester Weight 1.65 Colors Black or Green Camouflage Size Folds: 42 x 15.5 x 25cm, Unfold: 42 x 15.5 x 52cm