I bought this intending to use it when my 21kg Airedale Terrier stopped walking on walks, but it's more substantial than I expected and not easy to carry around, so I only tried it on once and haven't used it. I'm selling it now. The size was a perfect fit. The main unit is labeled S, but it's a 3XL according to the size chart in the photos. Adjustable harness-type carrier bag made with breathable mesh material. - Color: Black - Material: Nylon - Design: Harness type - Features: Breathable mesh material - Size: 3XL Thank you for looking.