Harley-Davidson Rugged High-Density Polyester Half-Helmet Backpack (Style: 99527) - Black. Made from rugged, high density polyester. Perfect fit for 1/2 helmet. Has the versatility to also be used as a carry-all bag. Expandable side for larger items. Detachable/adjustable shoulder strap, which can become backpack straps for carrying. Embroidered classic Bar & Shield logo. Capacity 3.8L. Size: 16" x 14.5".