Very cool bag! I took a larger size for my Chi weighing just over 3 kg, it came up perfectly! The bottom is rubberized, dense - it will be convenient for the paws, and you can put a small blanket inside. The upper part of the bag is made of breathable material. The fastener on the belt is adjustable, you can make it higher or lower. The belt is wide and comfortable, ergonomic. All in all - I recommend it definitely!