**A Prime Line® Exclusive!** Made of 210D Polyester and features grommeted adjustable soft black Nylon shoulder strap doubles as drawstring closure. Unique alternative to the basic cinch up backpack. Tennis ball stock art comes pre-printed on the front of each bag. Add your logo or message for an exciting and professional giveaway or promotion. Recommended weight tolerance: 6.5 lbs. United States Design Patent No.: US D615,756 S.