one of our sweet pups is getting old and sometimes gets tired on hikes and we wanted to be able to keep taking him so that meant finding him a comfortable pack to carry him around. we went the route of the usual dog bag where they can pop their head out and fully lay down in but our dog hated it + it was awful to hike with. so after what felt like searching online forever we came across the K9 sports sack and every review we read was stellar. it took us a while to decide on it though because to be honest the price put us off a little bit, however it was money well spent. our dog LOVES it and is super comfortable in it and really supported + it is super comfortable for us too. the materials are very durable and shows no sign of weakness. we are considering buying another one for our slightly bigger dog because it is THAT good.