- Made of strong nylon - For small dogs and cats - Up to 3 to 5 kg - 600D polyester for the bottom and 210D polyester for the side and rear panels The modern nylon backpack Maria is ideal for transporting small dogs or cats. Handy for on the road, in the shops, to the vet or during walks where you do not want to let your pet run loose. The backpack is very ergonomic. The breathable materials and the drawstring around the hole ensure that the bag is also ideal and comfortable for every animal.