Doggles Dog Backpack, Extreme Medium, Blue/Gray Waterproof Nylon and zippers Reflective trim and stripe for added safety Ergonomic fit throughout, with quick assist handle, roomy bags, and interior mesh for comfort. Available in sizes XX thru Large in Gray/Black and Blue/Gray combinations Size Medium fits Grith (around body, beh-inch d front legs) 26-37-inch/66-93cm (border collie)