adidas Y3 Men's Apparel Size Guide Coated polyester adidas® Y-3 by Yohji Yamamoto™ packable backpack with removable zip-off waist pack. Adjustable shoulder straps and top carrying handle. Front zipper pocket and logo patch. Imported. This item may ship with an attached security tag. Merchandise returned without the original security tag attached or a damaged tag may not qualify for a refund.