This great bag is the perfect size to put groceries in. The quick release is designed to quickly be detached and taken right into the store. It then attaches directly to your rear rack (not included). This bag comes with an adjustable carrying strap. These panniers fit our TerraTrikes well and attach easily to our rear rack. They can be used in conjunction with the seat bag and the trunk bag. Compatible with all trikes we currently sell. Not compatible with TerraTrike versions 1.9 and older. Rear rack is also required.