Tahoma is the lightest fully enclosed bag here: Happy Trails PNW lists the medium at 11 ounces and the large at 21 ounces. The shell is 20D ripstop nylon with a durable-water-repellent finish, the lining is water resistant, and the bag uses 530-fill, 80/20 responsibly sourced duck down plus a half-length YKK zipper and compression sack. The brand does not publish a laboratory dog-specific temperature rating, and down needs especially careful moisture management and a separate insulating pad on cold ground.
