A pet carrier backpack with a 70% polyester and 30% PVC outer, a polyester lining and PE foam filling. Size S is 31cm long with a 24cm interior, stands 22cm high and is recommended for pets within 5kg. Size L is 37cm long, 25-29cm high and recommended for pets within 10kg. The S carrier weighs 285g and the L weighs 334g.