The size is M, with a chest circumference of 41-47cm, a front leg to back leg distance of 13cm, and is for dogs weighing 2.5-4.5 kg. I purchased it on Amazon for 1940 yen. It appears when searching on Amazon for: 【YuHaru】 Dog Carrier Sling with Shoulder Pad (Denim Blue M). I think it's a good deal for anyone looking for a dog carrier.