This is the Arcadia Trail dog backpack in a size small. This bag was bought for my puppy but he never quite grew into it when it was adjusted to the smallest size. For reference he’s a 17-18 lb cavalier spaniel. No flaws, was never used only tried on my dog and then taken off! Measurements Chest girth: 22 inches to up to 26 inches This item comes from a smoke free but pet friendly home.