Crossbody Bag Alter Mat (Shell)STELLA McCARTNEY Crossbody Bag Alter Mat (Shell) Stella McCartney 56% , 44% : 50% , 50% : Shell : 22 31. 5 13 (.) This Logo small shoulder bag is a fresh, fun style for everyday. Made from smooth Alter Mat vegan alternative to animal leather, the shoulder bag has a perforated Stella McCartney medallion logo on the front and comes with an additional logo canvas strap made from recycled polyester. Main : 56% Polyurethane , 44% Polyester Lining : 50%