Includes a roll of 13 garbage bags. Buckle it on your telescoping retractor, or on your belt. ?€? Product size: 1.8 in x 2.7 in. Effective garbage bag size: 2.4 in and reel pulling diameter within 1.6 in ?€? Pressure-spring buckle design makes for simple installation. Easily attach to your belt, leash or other personal belongings ?€? The extraction port has transverse groove design, for rapid disposal of the garbage bag ?€? The plastic box can also be used portable canister for dog treats