The Tennis Ball Back Pack is a revolutionary training aid for tennis players at all levels. The Tennis Ball Back Pack has a 120 ball capacity and frees up the instructor to move laterally. The instructor can now play balls at the net or baseline with no hopper or cart to get in the way. This product is perfect for bringing your balls with you during travel. The Tennis Ball Back Pack includes a strap for racquet, lesson plan pouch, zipper pocket for keys, phone, etc., ID pouch w/padded shoulder straps, band for waist support and a netted pouch for a water bottle.