My dogs love their new portable dog bed. I have two dogs - one is ~75 lbs, and one is ~45 lbs. They both fit on the large bed with room to spare. The bed is comfortable and durable. They often come rock climbing with me and it is a great place for them to be comfortable, and also a great option for a PLACE command when we are out and about. I've started keeping it my car as a portable dog bed for places like restaurants, shows, breweries, etc.
It is a bit large for hiking with but still pretty small for the comfort and quality. The medium is probably more practical for that use. Would highly recommend!