The Optic Black and Gray Stand Bag by Sun Mountain with Optic and Z Putters branding on the front and sides. The 3.5 LS Bag weighs only 3.5lbs with a ton of features. Constructed with lightweight nylon fabric, high-strength-to-weight plastic and carbon fiber legs. Adding a pound allowed Sun Mountain to use a thicker strap, a more cushioned hip pad and to add several more pockets.